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21 Mar 2019, 22:33
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A
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Difficulty:
95%
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Question Stats:
49% (02:45) correct
51%
(02:45)
wrong
based on 89
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Each of the two positive integers X and Y has exactly 3 distinct prime factors. Least Common Multiple of X and Y has 5 distinct prime factors. X is divisible by 35 while Y is divisible by 33. Also X and Y are both even numbers, and neither of them is divisible by 4. On writing either X or Y in prime factorised form, it is observed that neither of them has a prime number with a power greater than 2. If the least common multiple of X & Y is denoted as N, then how many values of N are possible?
A. 16
B. 12
C. 10
D. 8
E. 4
A. 16
B. 12
C. 10
D. 8
E. 4
22 Mar 2019, 07:45
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amanvermagmat
So X is divisible by 35, that is 5*7, and X is even, so divisible by 2, thus \(X=2*5^{a}*7^{b}\).. power of 2 is just 1 as the number is not divisible by 4...
Also, Y is divisible by 33, that is 3*11, and Y is even, so divisible by 2, thus \(X=2*3^{c}*11^{d}\).. power of 2 is just 1 as the number is not divisible by 4...
LCM = \(2*3^c*5^a*7^b*11^d\)... Here a, b, c and d can take any of the two values, 1 or 2. Thus ways = 1*2*2*2*2=16
A
23 Jul 2025, 08:05
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