Question
Question: The coefficient of x<sup>5</sup> in expansion of (1 + x<sup>2</sup>)<sup>5</sup>(1 + x)<sup>4</sup> ...
The coefficient of x5 in expansion of (1 + x2)5(1 + x)4 is-
A
30
B
60
C
40
D
None
Answer
60
Explanation
Solution
$$= 54 + 10. 4 = 60