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From first twenty natural numbers, 2 num...

From first twenty natural numbers, 2 numbers are selected at random, the probability that the selected numbers are such that their sum is even is

A

`(.^(10)C_(2))/(.^(20)C_(2))`

B

`(.^(10)C_(2)+.^(10)C_(2))/(.^(20)C_(2))`

C

`(1)/(.^(20)C_(2))`

D

`(10)/(.^(20)C_(2))`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PROBABILITY-Exercise-I
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  15. P(AnnB)=(1)/(4), P(barA)=(1)/(3), P(B)=(1)/(2), then P(bar(AuuB))=

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  16. Suppose A and B are two events such that P(AnnB)=(3)/(25) and P(B-A)=(...

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