11th Standard Syllabus & Materials
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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Maths Test1.
Given p(A) = 0.5, P(B) = 0.6 and \(P(A\cap B)=0.24\) .Find
(i) \(P(A\cup B)\)
(ii) \(P(\vec { A } \cap B)\)
(iii) \(P\left( A\cap \bar { B } \right) \)
(iv) \(P\left( \bar { A } \cup \bar { B } \right) \)
(v) \(P(\bar { A } \cap \bar { B } )\)
2.
A die is thrown 3 times. Events A and B are defined as follows.
A: getting 4 on third die
B: getting 6 on the first and 5 on the second throw. Find the probability of A given that B has already occurred.
3.
A fair dice is rolled. Consider the following events A = {1, 3, 5}, B = {2, 3} and C ={2, 3, 4, 5} Find (i) P(A/B) and P(B/A) (ii) P(A\(\cap \)B/C)
4.
Three events A, B and C have probalilities \(\frac { 2 }{ 5 } ,\frac { 1 }{ 3 } \)and \(\frac { 1 }{ 2 } \) respectively. Given that P(A\(\cap \)C) = \(\frac { 1 }{ 5 } \), \(P(B\cap C)=\frac { 1 }{ 4 } \)find P(C/B) and P(\(\bar { A } \cap \bar { C } \))?
5.
One card is drawn from a well shuffled pack of 52 cards. If E is the event, "the card drawn is a king or queen" and F is the event "the card drawn is a queen or an ace", then find P(E/F).
1.
(i) p(A) = 0.5, P(B)= 0.6,\(P(A\cap B)=0.24\)
\(P(A\cup B)=P(A)+P(B)-P(A\cap B)\)
(i.e.,) \(P(A\cup B)\) = 0.5 + 0.6 - 0.24
= 1.1- 0.24 = 0.86
\(\therefore P(A\cup B)=0.86\)
(ii) \(P(\bar { A } \cap B)=P(B)-P(A\cap B)\)
= 0.6 - 0.24 = 0.36
(iii) \(P(A\cap \bar { B } )=P(A)-P(A\cap B)\)
= 0.5 - 0.24 = 0.26
(iv) \(P(\bar { A } \cup \bar { B } )=P\{ A\cap B'\} =1-P(A\cap B)\)
= 1 - 0.24 = 0.76
(v) \(P(\bar { A } \cap \bar { B } )=P\left\{ A\cup B' \right\} =1-P(A\cup B)\)
= 1- 0.86 = 0.14.
2.
n(S) = 6 \(\times\) 6 \(\times\) 6 = 216
A = {(1, 1, 4) (1, 2, 4) (1, 3, 4) (1, 4, 4) (1, 5, 4)(1, 6, 4) (2, 1, 4) (2, 2, 4) (2, 3, 4) (2, 4, 4) (2, 5, 4) (2, 6, 4) (6, 1, 4) (6, 2, 4) (6, 3, 4) (6, 4, 4) (6, 5, 4) (6, 6, 4)}
B = { (6, 5, 1) (6, 5, 2) (6, 5, 3) (6, 5, 4) (6, 5, 5) (6, 5, 6)}
\(\Rightarrow\) n(B) = 6
\(\Rightarrow P(B)=\frac { 6 }{ 216 } \)
\(A\cap B=\{ (6,\ 5,\ 4)\} \)
\(\Rightarrow \quad n(A\cap B)=1\)
\(\therefore P(A\cap B)=\frac { 1 }{ 216 } \)
\(\therefore P(A/B)=\frac { P(A\cap B) }{ P(B) } =\frac { \frac { 1 }{ 216 } }{ \frac { 6 }{ 216 } } =\frac { 1 }{ 216 } \times \frac { 216 }{ 6 } =\frac { 1 }{ 6 } \)
\(\therefore P(A/B)=\frac { 1 }{ 6 } \)
3.
n(S) = 6
Given n(A) = 3, n(B) = 2, n(C) = 4
A\(\cap \)B = {3}
\(\Rightarrow n(A\cap B)=1\)
\(\Rightarrow P(A\cap B)=1\)
\(P(A\cap B\cap C)=\frac { 1 }{ 6 } \)
\(A\cap B\cap C=\{ 3\} \)
\(\Rightarrow \quad n(A\cap B\cap C)=\frac { 1 }{ 6 } \)
(i) \(P(A/B)=\frac { P(A\cap B) }{ P(B) } =\frac { \frac { 1 }{ 6 } }{ \frac { 2 }{ 6 } } =\frac { 1 }{ 6 } \times \frac { 6 }{ 2 } =\frac { 1 }{ 2 } \)
\(P(B/A)=\frac { P(A\cap B) }{ P(A) } =\frac { \frac { 1 }{ 6 } }{ \frac { 3 }{ 6 } } =\frac { 1 }{ 6 } \times \frac { 6 }{ 3 } =\frac { 1 }{ 3 } \)
\(\Rightarrow \quad P(A\cap B/C)=\frac { P(A\cap B\cap C) }{ P(C) } =\frac { \frac { 1 }{ 6 } }{ \frac { 4 }{ 6 } } =\frac { 1 }{ 6 } \times \frac { 6 }{ 4 } =\frac { 1 }{ 4 } \)
4.
Given P(A) = \(\frac { 2 }{ 5 } \), P(B) = \(\frac { 1 }{ 3 } \) and P(C) = \(\frac { 1 }{ 2 } \)
\(P(A\cap C)=\frac { 1 }{ 5 } .P(B\cap C)=\frac { 1 }{ 4 } \)
\(\therefore P(C/B)=\frac { P(B\cap C) }{ P(B) } =\frac { \frac { 1 }{ 4 } }{ \frac { 1 }{ 3 } } =\frac { 1 }{ 4 } \times \frac { 3 }{ 1 } =\frac { 3 }{ 4 } \)
\(P(\bar { A } \cap \bar { C } )=P(\overline { A\cup C } )=1-P(A\cup C)=1-[P(A)+P(C)-P(A\cap C)]\)
\(=1-\left[ \frac { 2 }{ 5 } +\frac { 1 }{ 2 } -\frac { 1 }{ 5 } \right] =1-\left[ \frac { 4+5-2 }{ 10 } \right] =1-\frac { 7 }{ 10 } =\frac { 3 }{ 10 } \)
\(\therefore P(\bar { A } \cap \bar { C } )=\frac { 3 }{ 10 } \)
5.
n(S) = 52
There are 4 kings and 4 queens in a pack of cards
\(\therefore\) n(E) = 8
There are 4 queens and 4 aces in a pack of cards
\(\therefore\) n(F) = 8
\(\therefore P(E)=\frac { 8 }{ 52 } =\frac { 2 }{ 13 } \) and \(P(F)=\frac { 8 }{ 52 } =\frac { 2 }{ 13 } \) and \(P(E\cap F)=\frac { 4 }{ 52 } =\frac { 1 }{ 13 } \)
\(P(E/F)=\frac { P(E\cap F) }{ P(F) } =\frac { \frac { 1 }{ 13 } }{ \frac { 2 }{ 13 } } =\frac { 1 }{ 13 } \times \frac { 13 }{ 2 } =\frac { 1 }{ 2 } \)
11th Standard Syllabus & Materials
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Tamilnadu Stateboard 11th Standard Subjects

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Economics

Biology

Business Maths and Statistics

Accountancy

Computer Science

Physics

Chemistry

Maths

Biology

Economics

Physics

Chemistry

History

Business Maths and Statistics

Computer Science

Accountancy

Computer Applications

History

Computer Technology

Commerce

Computer Applications

Computer Technology

Tamil

English

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Tamilnadu Stateboard Standards