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All Chapter 3 Marks

11th Standard

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Business Maths

Time : 02:00:00 Hrs
Total Marks : 120
    Answer All The Following Questions:
    40 x 3 = 120
  1. Evaluate: \(\begin{bmatrix} 3&-2&4\\2&0&1\\1&2&3 \end{bmatrix}\)

  2. Show that \(\begin{vmatrix}x+a &b&c \\a &x+b&c\\a&b&x+c \end{vmatrix}=x^2(x+a+b+c)\)

  3. Using the properties of determinants, show that \(\left| \begin{matrix} 2 & 7 & 65 \\ 3 & 8 & 75 \\ 5 & 9 & 86 \end{matrix} \right| \)=0

  4. If \(A=\left[ \begin{matrix} 2 & 4 \\ -3 & 2 \end{matrix} \right] \)then, find A -1.

  5. How many number lesser than 1000 can be formed using the digits 5,6,7,8 and 9 if no digit is repeated?

  6. Resolve into Partial Fractions : \(\frac { 5x+7 }{ (x+1)(x+3) } \)

  7. In an examination, Yamini has to select 4 questions from each part. There are 6, 7 and 8 questions is Part I, Part II and Part III respectively. What is the number of possible combinations in which she can choose the questions?

  8. Let p(n) be the statement "n2 + n is even". If P(k) is true, then show that P(k+1) is true.

  9. Find the vertex, focus, axis directrix and the length of latus rectum of the parabola y2 - 8y - 8x +24 = 0

  10. A point moves such that its distance from the point (4, 0) is half that of its distance from the line x = 16, find its locus.

  11. Prove that the lines (b - c) x + (c - a) y + (a - b) = 0, (c - a) x + (a - b) y + (b - c) = 0, and (a - b) x + (b - c) y+c-a=0 are concurrent.

  12. Find the value of k so that the line 3x+4y-k = 0 is a tangent to x2+y2-64 = 0

  13. Prove that  \(\sec { \left( \frac { 3\pi }{ 2 } -\theta \right) } \sec { \left( \theta -\frac { 5\pi }{ 2 } \right) } +\tan { \left( \frac { 5\pi }{ 2 } +\theta \right) } \tan { \left( \theta -\frac { 5\pi }{ 2 } \right) } =-1\)

  14. Find all other trigonometrical ratios if \(\sin x=\frac{-2\sqrt6}{5}\) and x lies in III quadrant?

  15. Prove that\(\left\{1+\cot x-\sec\left(\frac{\pi}{2}+x\right)\right\}\left\{1+\cot x+\sec\left(\frac{\pi}{2}+x\right)\right\}=2\cot x\)

  16. If \(\sin { A } =\frac { 12 }{ 13 } \), find sin 3A

  17. If \(y=\sqrt { x } +\frac { 1 }{ \sqrt { x } } \) show that \(2x\frac { dy }{ dx } +y=2\sqrt { x } \).

  18. Differentiate: \(\sin ^{ -1 }{ \left( \sqrt { \cos { x } } \right) } \)

  19. Evaluate: \(\underset { x\rightarrow a }{ lim } \frac { { x }^{ \frac { 3 }{ 5 } }-{ a }^{ \frac { 3 }{ 5 } } }{ { x }^{ \frac { 1 }{ 5 } }-{ a }^{ \frac { 1 }{ 5 } } } \)

  20. Differentiate the following with respect to x.
    (i) xx
    (ii) (log x)cos x

  21. For the given demand function p = 40–x, find the value of the output when ηd=1

  22. The average cost function associated with producing and marketing x units of an item is given by AC = 2x - 11+\(\frac { 50 }{ x } \) Find the range of values of the output x, for which AC is increasing.

  23. Separate the intervals in which the function x3 + 8x2 + 5x - 2 is increasing or decreasing.

  24. For the production function P= 5(L)0.7(K)0.3.Find the marginal productivities of Labour (L) and Capital (K) when L = 10, K = 3 [Use (0.3)0·3 = 0.6968; (3.33)0·7 = 2.2322]

  25. Find the half yearly rate of interest, to get a perpetuity of Rs 675 for every half yearly from the present value of Rs 30,000

  26. Which is better investment 12% Rs 20 shares at Rs 16 (or) 15% Rs 20 shares at Rs 24.

  27. If I deposit Rs.500 every year for a period of 10 years in a bank which gives C.I. 5% per year, find out the amount I will receive at the end of 10 years.

  28. Ram bought at 9% stock for Rs.5400 at a discount of 11%. If the paid 1% brokerage, find the percentage of his income.

  29. Calculate the value of Q1, Q3, D6 and P50 from the following data

    Roll No 1 2 3 4 5 6 7
    Marks 20 28 40 12 30 15 50
  30. Calculate the Harmonic Mean of the following values:
    1, 0.5, 10, 45.0, 175.0, 0.01, 4.0, 11.2

  31. A card from pack 52 cards is lost. From the remaining cards of the pack, two cards are drawn and are found to be hearts. Find the probability of the missing card to be a heart? 

  32. Calculate the harmonic mean for the following data:

    Size of items 50-60 60-70 70-80 80-90 90-100
    No.of items 12 15 22 18 10
  33. Calculate the correlation co-efficient for the following data.

    X 5 10 5 11 12 4 3 2 7 1
    Y 1 6 2 8 5 1 4 6 5 2
  34. There are two series of index numbers P for price index and S for stock of the commodity. The mean and standard deviation of P are 100 and 8 and of S are 103 and 4 respectively. The correlation coefficient between the two series is 0.4. With these data obtain the regression lines of P on S and S on P.

  35. prove that the correlation co-efficient is the geometric mean of regression co-efficients.

  36. Find the co-variance and co-efficient of correlation for the following data:
    n=10, \(\sum\)x=50, \(\sum\)y=-30, \(\sum\)x2=290, \(\sum\)y2=300 and \(\sum\)xy=-115.

  37. A company is producing three products P1, P2 and P3, with profit contribution of Rs.20, Rs.25 and Rs.15 per unit respectively. The resource requirements per unit of each of the products and total availability are given below.

    Product P1 P2 P3 Total availability
    Man hours/unit 6 3 12 200
    Machine hours/unit 2 5 4 350
    Material/unit 1kg 2kg 1kg 100kg

    Formulate the above as a linear programming model.

  38. A firm manufactures two products A and B on which the profits earned per unit are Rs. 3 and Rs. 4 respectively. Each product is processed on two machines M1 and M2. Product A requires one minute of processing time on M1 and two minutes on M2, While B requires one minute on M1 and one minute on M2. Machine M1 is available for not more than 7 hrs 30 minutes while M2 is available for 10 hrs during any working day. Formulate this problem as a linear programming problem to maximize the profit.

  39. Solve the following LPP graphically. Maximize \(Z={ x }_{ 1 }+{ x }_{ 2 }\)
    Subject to the constraints \({ x }_{ 1 }-{ x }_{ 2 }\le -1,{ -x }_{ 1 }+{ x }_{ 2 }\le 0\quad and\quad { x }_{ 1 }+{ x }_{ 2 }\ge 0\)

  40. Construct the network for the projects consisting of various activities and their precedence relationships are as given below:

    Immediate Predecessor A B C D E F G H I
    Activity B C D,E,F G I H J K L

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