In a Calif. study, Dean Lester Breslow and Dr. James Enstrom of the UCLA School of Public Health concluded that by following 7 simple health rules a man's life can be extended by 11 years on the average, and a women's life by 7 years. The 7 rules are: 1. no smoking 2. regular exercise 3. use alcohol moderately 4. get 7 to 8 hours of sleep nightly 5. maintain proper weight 6. eat breakfast 7. do not eat between meals In how many ways can a person adopt exactly FIVE of these rules IF : a) the person presently violates all 7 rules? b) the person already never drinks and always eats breakfast?
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