If r,s,t are prime numbers and p,q are the positive Integers such that the LCM of p,q is r^2 x t^4 x s^2. The number of ordered pair (p,q) is a. 252 b. 254 c. 225 d. 224
p=r^a s^b t^c and q= r^u s^v t^w
LCM = e= r^i s^j t^k
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