Question 1
The sum of the coefficients of all the terms in the expansion of $$(5x - 9)^{4}$$ is __________.
Correct Answer: 256
Solution
For finding sum of coefficients, we have to put the value of x as 1.
So, sum of coefficients =$$(5-9)^4=\left(-4\right)^4=\left(4\right)^4=256$$
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