GMATD11 wrote:
From B and E whts wrong with E
Just follow the rules of exponents. Answer will follow.
Cube root is the power of 1/3. Square root is the power of 1/2
\(n^{\frac{1}{3}}*n^{\frac{1}{2}} = \frac{n}{2}\)
You need to find n. So bring all n's together on one side of the equation and everything else on the other side.
Adding the exponents, \(n^{\frac{5}{6}} = \frac{n}{2}\)
Clubbing n's together, \(2 = n^{1-\frac{5}{6}}\)
\(n = 2^6 = 64\)
Hence it cannot be 729. If in the question, rather than half, we had a third, answer would have been 729.
I really need to study these formulas, where do I suggest I go?