Differential EquationMedium
Question
If r, s, t are prime numbers and p, q are the positive integers such that the LCM of p, q is r2t4s2, then the number of ordered pair (p, q) is
Options
A.252
B.254
C.225
D.224
Solution
Required number of ordered pair (p, q) is (2 × 3 - 1) (2 × 5 - 1) (2 × 3 - 1) = 225.
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