Two numbers are selected simultaneously from the set {6, 7, 8, 9, ………. 39}. If the sum of selected numbers is even then the probability that both the selected numbers are odd, is equal to:
A
833
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B
4091
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C
5191
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D
12
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Solution
The correct option is D12 Required probability =p(bothodd)p(sumeven)=17C217C2+17C2=12