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Tow numbers are selected randomly from the first fifteen natural numbers.If the sum of the numbers selected is even,find the probability that both numbers are even?

Tow numbers are selected randomly from the first fifteen natural numbers.If the sum of the numbers selected is even,find the probability that both numbers are even? 

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1 Answers

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

Dear LINTA

sum of the selected number will be even is both are enen or both are odd.

we have   1,3,5,7,9,11,13,15   odd number

              2,4,6,8,10,12,14     even number


 2 even number can be selected = 7C2 

2 odd number can be selected = 8C2


so probability = 7C2/(7C2 + 8C2 )

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