A box contains 5 pairs of shoes. If 4 shoes are selected, then the number of ways in which exactly one pair of shoes obtained is

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120

140

160

180

answer is A.

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Detailed Solution

The no of ways in which one pair of shoe is selected from 5=5c1 Remaining 2 shoes can be selected from 8 in 8c2 ways=5c1(8c2−4c1)=120

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