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**cyt91** It has been found that 65% of women over 50 years old suffers from osteoporosis. 8 women were randomly chosen from a group of women over 50 years old.

(a)Find the probability that out of these 8 women, more than 6 of them suffered from osteoporosis. Ans:0.1691

20% of women suffering from osteoporosis recovers after 2 years. If 3 women of age above 50 years old were randomly chosen,

(b)find the probability that none of them suffer from osteoporosis. Ans:0.1106

I managed to solve (a) only. How do you solve (b)?

Thanks for your help.