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A bag contains twelve pairs of socks and four socks are picked up at random. The probability that there is at least one pair is equal to - |
Answer» P(atleast one pair) `= 1-`P(getting no pair) `= 1- (.^12C_4.^2C_1 .^2C_1 .^2C_1.^2C_1)/(.^24C_4)` `= 1- ((12xx11xx10xx9 xx2^4)/(4!))/((24 xx 23 xx 22xx21)/(4!))` `= 1-120/161` P( geeting atleast 1 pair) ` =41/161` option D is correct answer |
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