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IN HOW MANY WAYS 20 IDENTICAL PENCILS BE DISTRIBUTED AMONG 3 GIRLS SO THAT EACH GIRL CONTAIN ATLEAST 1 PENCIL
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- restricted combination:
simple formula- n-m C r-m
Here, n=20, m=1, r=3
so ans will b 19C2 = 171 - 11 years agoHelpfull: Yes(14) No(0)
- atleast one pencil means girl would have one or all other pencils. Thats why on applying permutation solution would be -- 20*19*18=6840 ways
- 11 years agoHelpfull: Yes(1) No(4)
- 20c3 = 20 * 3 * 19 = 1140 ways
- 11 years agoHelpfull: Yes(1) No(5)
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