coxbazar divisional 2014 Q.no.-2

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Mahfuz Sobhan
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Joined: Sat Feb 07, 2015 5:40 pm

coxbazar divisional 2014 Q.no.-2

Unread post by Mahfuz Sobhan » Sat Dec 12, 2015 6:31 pm

Hasib went to the kite festival with five friends and bought 12 kites. They were all of different colors. He and his friend Tahmid took 2 kites and told the others to pick any one among other kites. In how many ways can they do it?

SYED ASHFAQ TASIN
Posts: 21
Joined: Thu Jun 02, 2016 6:14 pm

Re: coxbazar divisional 2014 Q.no.-2

Unread post by SYED ASHFAQ TASIN » Thu Dec 15, 2016 7:25 pm

Hasib Tahmid could take in (12c 2) way.Then there will be 10 kites.Others can take (10c3)ways.So,there is (12c2)*(10c3)ways. IS IT RIGHT?
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samiul_samin
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Re: coxbazar divisional 2014 Q.no.-2

Unread post by samiul_samin » Mon Feb 18, 2019 4:33 pm

SYED ASHFAQ TASIN wrote:
Thu Dec 15, 2016 7:25 pm
Hasib Tahmid could take in $(12c 2)$ way.Then there will be $10$ kites.Others can take $(10c3)$ways.So,there is $(12c2)×(10c3)$ways. IS IT RIGHT?
Yes, you are right. Answer=$\dbinom {12}{2} ×\dbinom {10}{3}=7920$

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