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

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.
 We are all IITians and here to help you in your IIT JEE preparation.

 All the best raman
 
Regards,
Askiitians Experts
Badiuddin