13.

LCM of two numbers is 14 times their HCF. The sum of LCM and HCF is 600. If one number is 280 then the other number is

Group 1 - 2014

14.

Find the L.C.M of 4^{5},4^{-81},4^{12} and 4^{7}

Group 2 - 2015

15.

Which one of the following statements is false?

Group 4 - 2018

A.

Among the common divisors of given numbers,the greatest divisor is the G.C.D.

B.

If the G.C.D. of any two numbers is 1 they are said to be prime numbers

C.

Among the commom multiples of given numbers,the least is the L.C.M

D.

The product of any two numbers is equal to the product of their G.C.D. and L.C.M.

16.

Find the H.C.F of 4/9,2/5,6/8,2/5

Group 2 - 2015

17.

The number of numbers-pairs lying between 40 and 100 with their H.C.F. as 15 is

Group 4 - 2013

18.

The sum of two numbers is 20. Their product is 96. then their H.C.F. is

Group 1 - 2013