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#lang racket
(define (want-number num)
(cond [(= (modulo num 3) 0) #t]
[(= (modulo num 5) 0) #t]
[else #f]))
(define (my-sum start limit)
(cond [(= start limit) 0]
[else (+ (cond [(want-number start) start]
[else 0])
(my-sum (+ start 1) limit))]))
(my-sum 1 1000)
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