A) \[20c\]
B) \[10c\]
C) \[10{{c}^{3}}\]
D) \[20{{c}^{2}}\]
Correct Answer: C
Solution :
2(5 - r) + (-1) r = 1 \[\Rightarrow \] 10 - 2r - r = 1 \[\Rightarrow \,r=3\] Thus coefficient of y is\[^{5}{{C}_{3}}{{c}^{3}}=\frac{5\times 4}{2\times 1}{{c}^{3}}=10{{c}^{3}}\].
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