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a_sh-v [17]
3 years ago
11

At a particular store, candy bars are normally priced at $1.00 each. last week, the store offered a promotion under which custom

ers purchasing one candy bar at full price could purchase a second candy bar for $0.50. a third candy bar would cost $1.00, a fourth would cost $0.50, and so on. if, in a single transaction during the promotion, rajiv spent d dollars on n candy bars, where d and n are integers, is n even?
Business
1 answer:
ipn [44]3 years ago
6 0
<span>1 candy cost 1 2 candies cost 1+.50=1.50 ( here D is not an integer, hence we cannot buy 2 candies . so we can reject all cases where D is non Integer) 3 candies cost 1.50 +1 =2.50 4 candies cost 2.50+.50= 3 5 candies cost 3+1= 4 6 candies cost 4+.50= 4.50 7 candies cost 4.50+1=5.50 8 candies cost 5.50.+.50= 6 9 candies cost 6+1= 7 ..... 13 candies cost =10 (i) D is prime D=3 and N=4 (N is even) D=7 N=9 (N is odd ) not sufficient (ii) D is not Divisible by 3 D=1 N=1 D=4 N =5 D=7 N=9 D=10 N=13 so we see if D is not divisible 3 then N is always odd.</span>
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