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Question

Three children are selected at random from a group of 6 boys and 4 girls. It is known that in this group exactly one girl and one boy belong to same parent. The probability that the selected group of children have no blood relations, is equal to

A
115
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B
1315
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C
1415
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D
215
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Solution

The correct option is C 1415
P(boyand his sister both are selected) = 8C110C3=115
required probability = 1115=1415

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