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If r, s, t are prime numbers and p, q are the positive integers such that their LCM of (p, q) is r^2t^4s^2then the numbers of ordered pair of (p, q) is (A ) 252 ( B) 254(C ) 225(D ) 224

T Jahnavi , 8 Years ago
Grade 11
anser 1 Answers
Vikas TU

Last Activity: 8 Years ago

exponent of r could be seleected as: => 1 + 2 + 2 = 5  ways.
For t = > 4 + 4 +1 = 9 ways.
for s = > 1 + 2 + 2 = 5 ways.
Therefore, 
no. of ordered pairs (p,q) choosen as: 5*9*5 = 225 ways.

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