no of natural numbers less than 100 with exactly 4 factors
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Answer:
there are a total of 32 no under 100 which have exactly four factors
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Step-by-step explanation:
Integers less than 100 with exactly 4 odd factors but no even factors:
15=3*5 --> factors 1, 3, 5, 15;
21=3*7 --> factors 1, 3, 7, 21;
27=3^3 --> factors 1, 3, 9, 27;
33=3*11 --> factors 1, 3, 11, 33;
35=5*7 --> factors 1, 5, 7, 35;
39=3*13 --> factors 1, 3, 13, 39;
51=3*17 --> factors 1, 3, 17, 51;
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