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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Maths Test1.
In the given factorization, find the numbers m and n.
2.
Prove that two consecutive positive integers are always coprime.
3.
A positive integer when divided by 88 gives the remainder 61. What will be the remainder when the same number is divided by 11?
4.
Prove that square of any integer leaves the remainder either 0 or 1 when divided by 4.
5.
When the positive integers a, b and c are divided by 13, the respective remainders are 9,7 and 10. Show that a + b + c is divisible by 13.
6.
7.
Find all positive integers, when divided by 3 leaves remainder 2.
8.
Show that the square of an odd integer is of the form 4q + 1, for some integer q.
9.
Find the quotient and remainder when a is divided by b in the following a = −12, b = 5
10.
We have 34 cakes. Each box can hold 5 cakes only. How many boxes we need to pack and how many cakes are unpacked?
1.
Value of the first box from bottom = 5 x 2 = 10
Value of n = 5 x 10 = 50
Value of the second box from bottom = 3 x 50 = 150
Value of m = 2 x 150 = 300
Thus, the required numbers are
m = 300, n = 50
2.
Let the two consecutive positive integers be n and n + 1
Here n + 1 > n
By Euclid's Division Algorithm, we have
n + 1 = n x q + 1 for some integer
Remainder = 1
Again applying Euclid' s Division Algorithm
n = 1 x (n) + 0
Here the remainder = 0
H.C.F. is the last divisor 1.
H.C.F.(n, n + 1) = 1
i.e., H.C.F. of two consecutive positive integers = 1
Two consecutive positive integers are always coprime.
3.
Let the positive integer be 'n'
So n = 88 (p) + 61, where p be an integer
n = 88 (p) + (5 x 11 + 6)
n = 8 x 11 x p + 5 x 11 + 6
n = 11 (8p + 5) + 6
Dividing both the sides by 11, we get
\(\frac{n}{11}=(8 p+5)+\frac{6}{11}\)
When the same number n is divided by 11 the remainder will be 6.
4.
All the integers 'a' must be either even or odd.
If it is even then a = 2q.
If it is odd then a = 2q + 1
Case 1:
lf a = 2q
a2 = (2q)2
a2 = 4q2, remainder 0 when divided by 4.
Case 2:
If a = 2q+ 1
a2 = (2q + 2)2
= 4q2 + 4q + 1
= 4q ( q + 1) + 1
a2 = 4m + 1 Where m = q (q + 1) is an integer
It is of the form bq + 1 where 1 is the remainder when divided by 4.
The square of any integer leaves the remainder either 0 or 1 when divided by 4.
5.
Given the positive integers a, b and c divided by 13 leaves remainders 9, 7, 10 respectively
By Euclid's division Lemma we have
a = 13q1+ 9
b = 13q2 + 7
c = 13q3 + 10
a + b + c = 13q1 + 9 + 13q2 + 7 + 13q3 + 10
= 39[q1 + q2 + q3] =13m
where m = q1 + q2 + q3 +2 and m is positive integer. which is divisible by 13
a + b + c is divisible by 13.
6.
7.
Let the required positive integer be a.
Given a is divided by 3 leaves remainder 2.
By Euclid's Division Lemma a and b are any positive integers, then there exist unique integer q and r such that
a = bq + r where 0 < r < lbl
Here a = 3q + r where 0 < r < l3l
r = 0, 1, 2
Considering r = 2
a = 3q + 2,where q > 0
i.e., a = 3q + 12, q = 0, 1, 2,3,...
a = 3 (0) + 2,3 (1) + 2, 3 (2) + 2,3 (3) +2, ...
a = 2, 5, 8, 11, ...
The required numbers are 2,5, 8, 11, ...........
8.
Let x be any odd integer. Since any odd integer is one more than an even integer, we have x = 2k + 1 for some integer k.
x2 = (2k + 1)2
= 4k2 + 4k + 1
= 4k(k + 1) + 1
= 4q + 1, where q = k (k + 1) is some integer
9.
a = -12, b = 5
By Euclid’s division lemma
a = bq + r , Where 0 \(\le\) r < |b|
-12 = 5 x (-3) + 3 0 \(\le\) r < |5|
Therefore , Quotient q = -3, Remainder r = 3
10.
We see that 6 boxes are required to pack 30 cakes with 4 cakes left over. This distribution of cakes can be understood as follows:
| 34 | = | 5 | x | 6 | + | 4 |
| Total number of cakes | = | Number of cakes in each box | x | Number of boxes | + | Number of cakes left over |
| \(\downarrow\) | \(\downarrow\) | \(\downarrow\) | \(\downarrow\) | |||
| Dividend \(\alpha\) |
= | Divisor \(\beta\) |
x | Quotient q |
+ | Remainder r |
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