book Maths Puzzle Numerical Ability

Find S(with a sideways 8 beside it) if an=27(1/3)^n, n=1,2,3,4,... I have no idea how to do this problem. Please help me.

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book Other Question

Suppose that an experiment is repeated four times. A certain event has probability 1/10 in a single repetition of the experiment. What is the probability that it occurs at least once? Ms. bell has money invested in two enterprises. She has $900 more invested at 8% than she does at 6% a year. She earned $170 of annual interest from teh investments. How much does