A) 25
B) 28
C) 27
D) 24
Correct Answer: A
Solution :
\[^{5}{{C}_{1}}{{.}^{n}}{{C}_{2}}+{}^{5}{{C}_{2}}{{.}^{n}}{{C}_{1}}=1750\] \[{{n}^{2}}+3n=700\] \[\therefore \] n = 25You need to login to perform this action.
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