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raman malik Grade: 12
        

If r,s,t are prime numbers and p,q are the positive integers such that the L.C.M. of p,q is r2s4t2, then the number of ordered pairs of (p,q) is


A) 252


B)254


C)225


D)224

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Hi raman malik


Required number of ordered pair (p, q) is (2 × 3 − 1) (2 × 5 −1) (2 × 3 − 1) = 225.


so answer  c is correct





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Badiuddin

7 years ago
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