Also part B) how many ways if the person already gets 7-8 hours of sleep? Note t

Question

Also part B) how many ways if the person already gets 7-8 hours of sleep?
Note the answer to part a is not 10 A study concluded that following 7 simple health rules can extend a man's life by 11 years on the average and a woman's life by 7 years. These 7 rules are as follows: no smoking. get regular exercise, use alcohol only in moderation, get 7 to 8 hours of sleep, maintain proper weight, eat breakfast, and do not eat between meals. In how many ways can a person adopt 5 of these rules to follow (a) if the person presently violates 5 of the 7 rules? (a) There are ways.

Explanation / Answer

Solution:-

a) There are 21 ways.

Total rules = 7

Number of ways to violet 5 rules = 7C5 = 21

There are 21 ways.

b) Number of ways if a person already gets 7 to 8 hours of sleep is 15 ways.

Total rules = 7

Number of ways to violet 5 rules =1 ×  6C4 = 15

Number of ways if a person already gets 7 to 8 hours of sleep is 15 ways.

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