Multiple Choice Questions

L C M of two prime numbers x and y x gt y is 161 The value of 3y x is ........

Quantitative Aptitude(IBPS PO) LCM, HCF

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

-2

-1

H. C. F of two prime numbers is 1.

Product of numbers = 1 x 161 = 161.

Let the numbers be a and b . Then , ab= 161.

Now, co-primes with product 161 are (1, 161) and (7, 23).

Since x and y are prime numbers and x >y , we have x=23 and y=7.

Therefore, 3y-x = (3 x 7)-23 = -2

Hence, option 1 is the correct answer.

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