book Maths Puzzle Numerical Ability

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?

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book Other Question

How do you factor the polynomial (x^3+8x^2+17x+10 completely, given that x+2 is a factor?

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Thanks 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.