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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

10 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


Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
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Askiitians Experts
Badiuddin

10 years ago
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