10m-15 = 5(2m-3), so the second is a multiple of the first. I agree they are not coprime.
2m-3 and 10m-15 are coprime integers.Which of the choices from below
is coprime with each one of the numbers?
a)3m-1
b)m+4
c)2m+6
d)m+3
e)5m
Answer is b.
I couldn't find the answer.
First of all both numbers are not coprime. When we divide them with
each other we get 5 or 1/5.
in order for 2m-3 and 10-15=5(2m-3) to be coprime m=2.
Thus we have 1 and 5 as our two numbers. The values corresponding to the answers are
a)5
b)6
c)10
d)5
e)10
and clearly of these only 6 is coprime to to 5 so (b) must be the answer.