In a group of 9 boys and 5 girls, 5 students have to be selected. In how many ways it can be done so that only 2 boys are included.
=>9C2×5C3= [9!/(9 -2)! 2!] × [5!/(5 -3)! 3!] => [9!/7! 2!] × [5!/2! 3!] => 360 ways
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