What is the lowest prime factor of the sum of all the numbers from 5 to 37, inclusive?
A) 3
B) 5
C) 7
D) 11
E) 37
A) 3
B) 5
C) 7
D) 11
E) 37
I go with A.umaa wrote:What is the lowest prime factor of the sum of all the numbers from 5 to 37, inclusive?
A) 3
B) 5
C) 7
D) 11
E) 37
heres how
sum of all umbersfrom 5 to 37.
n/2 ( first term + last term )
n= 37-5+1=33
33/2*(5+37)
33*21 = 693
now 693 can be wrtitten as
3^2*7*11
hence the answer is 3.
hope it helps..
