10. The first 3 terms, in ascending powers of \(x\), in the binomial expansion of \(( 1 + a x ) ^ { 20 }\) are given by
$$1 + 4 x + p x ^ { 2 }$$
where \(a\) and \(p\) are constants.
- Find the value of \(a\).
- Find the value of \(p\).
One of the terms in the binomial expansion of \(( 1 + a x ) ^ { 20 }\) is \(q x ^ { 4 }\), where \(q\) is a constant.
- Find the value of \(q\).