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There are 10 professors and 20 lecturers out of whom a committee of 2 professors and 3 lecturer is to be formed.Find In how many ways a particular lecturer is included

$\begin{array}{1 1}(A)\;10C_2\times 19C_2\\(B)\;9C_2\times 9C_3\\(C)\;7C_2\times 19C_3\\(D)\;\text{None of these}\end{array} $

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Total professor =10
Total lecturer =20
No of ways to include a particular lecturer =$10C_2\times 19C_2$
Hence (A) is the correct answer.
answered May 19, 2014 by sreemathi.v

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