If the 2nd, 3rd and 4th terms in the expansion of `(x+a)^n` are 240, 720 and 1080 respectively, find `x ,\ a ,\ ndot`

Explanation

To solve the problem step by step, we will use the information given about the second, third, and fourth terms in the expansion of \((x + a)^n\).

### Step 1: Write the General Term
The general term \(T_{r+1}\) in the expansion of \((x + a)^n\) is given by:
\[ T_{r+1} = \binom{n}{r} x^{n-r} a^r \]

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