What is the product?

StartFraction 4 n Over 4 n minus 4 EndFraction times StartFraction n minus 1 Over n + 1 EndFraction

StartFraction 4 n Over n + 1 EndFraction

StartFraction n Over n + 1 EndFraction

StartFraction 1 Over n + 1 EndFraction

StartFraction 4 Over n + 1 EndFraction

Correct option: second one - > n / (n+1)

Step-by-step explanation:

Writting the expression, we have:

[4n / (4n-4) ] * [ (n-1) / (n+1) ]

First we can simplify the numerator of the first part, dividing numerator and denominator by 4:

[n / (n-1) ] * [ (n-1) / (n+1) ]

The first fraction has n-1 in the denominator and the second fraction has n-1 in the numerator, so we can simplify then in the product:

n * [1 / (n+1) ] = n / (n+1)

The final expression is n / (n+1), so the correct option is the second one.

B: n = 20