Just 1 and 11.
I am so board
11 is prime, so only 11 and 1
Yes. Factor pairs are always repeated across pairs since factor pairs are certain kinds of pairs.
The factor pairs of 28 are :28,114,27,4
the factor pairs are 1x35 & 5x7
Sixteen factor pairs.
Eleven has no such factor.
The factor pairs of 27 are 1x27 and 3x9.
The factor pairs of 57 are 3x19 and 1x57
its a factor with two pairs of the same number
Mathematicians call them "factor pairs."
The factor pairs of 91 are (1,91) and (7,13).