Which is the prime factorization of 86?
1 Answer
Feb 9, 2017
Explanation:
First note that
#86 = 2 xx 43#
You may know that
-
#43# ends with an odd digit, so is not divisible by#2# -
The sum of the digits of
#43# is#4+3 = 7# , which is not divisible by#3# , so#43# is not divisible by#3# either. -
The last digit of
#43# is not#0# or#5# , so it is not divisible by#5# . -
#43/7 = 6# with remainder#1#
Note that
So