Which of the following is NOT a factor of 12(^{4}) – 5(^{4})?
-
A.
7 -
B.
13 -
C.
17 -
D.
49 -
E.
169
Correct Answer: Option D
Explanation
124 – 54 = (122)2 – (52)2
= (122 + 52) x (122 – 52)
(144 + 25)(144 – 25)
= (169)(119)
Factors of above 169, 17, 13, 7