Question
Question: The sum of the coefficient in the expansion of (1 + 5x – 7x<sup>3</sup>)<sup>3165</sup> is –...
The sum of the coefficient in the expansion of (1 + 5x – 7x3)3165 is –
A
1
B
23165
C
23164
D
–1
Answer
–1
Explanation
Solution
For sum of coefficient,
put x = 1, (1+5–7)3165 = (–1)3165 = –1