Q.

Define an equivalence relation R on the positive integers A = {2, 3, 4, . . . , 20} by m R n if the largest prime divisor of m is the same as the largest prime divisor of n. The number of equivalence classes of R is

A. 8
B. 10
C. 9
D. 11
Answer» A. 8
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Discrete Structure (DS)

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