exam Maths Puzzle Numerical Ability

I am just not getting this section....

Use the formula for S[n] to find the sum for the geometric sequence: 4,-16,64,-256,1024.

Thanks in advance.

Annie C.

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exam Other Question

If you have a bucket of water at 10 degree Fahrenheit and another at 10 degree Celsius and drop a 50 cents coin to each, which coin will be the first to reach the bottom of the bucket? Perform the indicated operations:
3sqrt[3] + 2sqrt[27] �sqrt[12]