A) There are how many years? Ans. Not 21 nor 10 B) There are how many years? X)

Question

A) There are how many years? Ans. Not 21 nor 10 B) There are how many years?
X) 2.3.26 Question Help 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? (b) if the person always eats breakfast? (a) There are ways.

Explanation / Answer

Answer to the question is as follows:

a. For both men and women there are 7 simple steps health rules

If he violates 5 out of 7 rules, and he is to adapt 5 out of 7 rules then , there only 1 way of choosing 5 out of 7 that he is not violating. Hence, there is only way he can choose 5 out 7 rules, ( because he isn't violating the other 2)

Answer is 1

b. If he eats breakfast then 1 rule is being followed. From the remaining 6 rules he must adapt any 4

This can be done is 6C4 ways = 6!/4!2! = 15 ways

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