Question
From 6 officers and 8 Jawans, in how many ways can 5 be
chosen to include exactly 3 officers?Solution
Required Number of ways = 6C3 × 8C2 = 6!/(3! ×3!)  ×  8!/(2! ×6!) = 20 × 28 = 560
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11 people decided to spend an afternoon in two groups. A group of them decided to go to the theater and the remaining decided to play tennis. In how man...
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