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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?
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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