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There are 15 boys and 10 girls in your class. A four member committee is to be formed from the students of your class. In how many ways this can be done if

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There are 25 students total. 4 students are taken at a time.
Then no. Of ways
25!/(25-4)!4!=7286400 ways.

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There will be two cases. In first 3 girls and 1 boy, number of ways = 10C3× 15C1 = 1800 ways In second case, 4 girls and 0 boys, number of ways = 10C4 =210 so total number of possible ways = 1800 + 210 = 2010