The task is to generate the correct answer for a given math problem.

Q: Problem: if a * b * c = ( √ ( a + 2 ) ( b + 3 ) ) / ( c + 1 ) , find the value of 6 * 15 * 1 .

A: 2
****
Q: Problem: what is the range of all the roots of | x ^ 2 - 4 | = x ?

A: 3
****
Q: Problem: if 2 ^ 2 n + 2 ^ 2 n + 2 ^ 2 n + 2 ^ 2 n = 4 ^ 28 , then n =

A:
27
****