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Old 08-06-2007   #1
Neha S
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Default A lil math (probability) help!?

A graphing calculator is programmed to generate a number between 1 and 20. a) What is the probability that three consecutive prime numbers (1,2,3,7,11,13,17) will be produced?b) What is the probability that atleast one of the first three numbers will be prime?For a) P= 8c3 / 20c3 = 0.049and for b)P = 1- P(2 numbers aren't prime) 1- (2/12) = 0.833Is that somewhat right?