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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