Q. 244.2( 9 Votes )

# A sports team of

Answer :

Formula:- (i)^{n}C_{r}

A team of 11 students can be constituted in the following two ways:-

case(i):- 5 students from class X I and 6 from X II

case(ii):- 6 students from class X I and 5 from X II

the number ways can the team be constituted: -

Case(i)+case(ii)

=^{20}C_{5.} ^{20}C_{6}+^{20}C_{6.}^{20}C_{5}

=2(^{20}C_{5.} ^{20}C_{6})

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