A.which is the smallest number , which when divided separately by 15,20 and 30 . will in each case leave 7 as a reminder ?
B. Write down separately the prime and composite numbers less than 20.
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Prime numbers less than 20 are 2,3,5,7,11,13,17,19
Composite numbers less than 20 are 4,6,8,9,10,12,14,15,16,18
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