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Question

The total number of ways of selecting six coins out of 20 one-rupee coins, 10 fifty- paise coins, and 7 twenty-five paise coins is:

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Solution

Using multinomial theorem, we have
x1+x2+x3=6 where 0x16 0x20 0x30
Total no. of ways is n+r1Cr
=3+61C6=8C6
=28

1118925_1201876_ans_f10c0c8b644d4b0796fe9045b59331c6.jpg

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