The L.C.M. of two prime numbers $x$ and $y$ , where $(x > y)$ , is $161$ . The value of $3 y - x$ is

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Solution

The correct option is A $- 2$
The prime factors of $161$ are $7$ and $23$
Since it is given that $x > y, x = 23, y = 7$
$∴$ $3 y - x = 3$ $\times$ $7 - 23 = 21 - 23 = - 2$

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