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hi vivek
when u select a pir out of 400 socks then the remaining will be 398
so no. of favourable cases will be 200 * 398
IF THERE ARE 200 PAIRS OF SOCKS THEN THERE WOULD BE 200 WAYS TO SELECT A PAIR
AND THE THIRD SOCK WILL BE ONE OF THE REMAING 400 SO THE
NUMBER OF FAVOURABLE CASES IS 200 * 400
AND THE SAMPLE SPACE WILL BE SELECTING ANY 3 OUT OF 400
SO C(400 , 3)
SO PROBABILITY IS (200* 400)/ C (400 , 3)
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