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First three terms in the expansion of (x...

First three terms in the expansion of `(x+a)^n` are respectively 128, 2240 and 16800
The value of `(a-x)^n` is equal to

A

`(-3)^7`

B

`3^7`

C

`7^7`

D

none of these

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The correct Answer is:
B
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