The second, third and fourth terms in the binomial expansion `(x+a)^n`are 240, 720 and 1080, respectively. Find x, a and n.

Explanation

To solve the problem, we need to find the values of \( x \), \( a \), and \( n \) given that the second, third, and fourth terms of the binomial expansion \( (x + a)^n \) are 240, 720, and 1080, respectively.

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

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