### All GRE Subject Test: Math Resources

## Example Questions

### Example Question #1 : Numerical Approximation

For which values of p is

convergent?

**Possible Answers:**

All positive values of

only

it doesn't converge for any values of

**Correct answer:**

only

Explanation:

We can solve this problem quite simply with the integral test. We know that if

converges, then our series converges.

We can rewrite the integral as

and then use our formula for the antiderivative of power functions to get that the integral equals

.

We know that this only goes to zero if . Subtracting p from both sides, we get

.

Jaroslaw

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### All GRE Subject Test: Math Resources

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