Question

Need help please :( What is the second term of (s+v)^5?

A. 25s^4
b. 25s^4v
c.5s^4v
d.125s^4v

Answer 1

First compute the coefficient like this:

`C_5^1=(5!)/(1!(5-1)!)=(5!)/(4!)=(5*4!)/(4!)`
Simplifying the fraction over 4! we get:

`C_5^1=5`
and the variables are
`s^4v`. So answer
`5s^4v`.

The correct answer is C then.