# Practice GMAT Problem Solving Question

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If n # z = n

^{2}- n^{z}- 2(z-2)^{n}for integers n and z, what is the value of 2#2?Correct Answer:

**D**- Plug in n = 2 and z = 2
- Evaluate the expression:

n # z = n^{2}- n^{z}- 2(z-2)^{n}

2 # 2 = 2^{2}– 2^{2}– 2(2-2)^{2}

= 4 – 4 – 2(0)^{2}

= 4 - 4 - 0 = 0 – 0 = 0

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