Question : The L.C.M. of two prime numbers x and y (x>y) is 161. The value of (3y - x):
Option 1: -2
Option 2: -1
Option 3: 1
Option 4: 2
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Correct Answer: -2
Solution :
161 has the only prime factor is (7, 23)
and (x>y) so x = 23, y = 7
The value of (3y - x)
= 3×7-23
= 21-23
= -2
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