A California study concluded that by following 7 simple healthrules a man\'s lif

Question

A California study concluded that by following 7 simple healthrules a man's life can be extended by 11 years on the average and awoman's life by 7 years. These 7 rules are as follows: nosmoking, regular exercise, use alcohol moderately, get 7 to 8 hoursof sleep, maintain proper weight, eat breakfast, and do not eatbetween meals. In how many ways can a person adopt five ofthese rules to follow.
(a) If the person presently violates all 7 rules
(b)If the person never drinks and always eats breakfast

Explanation / Answer

b) if the person presently has 2 habits then he/she has toadapt 3 more habits out of the remaining 5. Hence he/she can do itby choosing 3 out of 5 in 5c3 = 10 ways.
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