Which of the following is NOT a factor of 12\(^{4}\) - 5\(^{4}\)?

  • A 7
  • B 13
  • C 17
  • D 49
  • E 169
jamb 1980mathematics

The correct answer is D. 49

124 - 54 = (122)2 - (52)2

= (122 + 52) x (122 - 52)

(144 + 25)(144 - 25)

= (169)(119)

Factors of above 169, 17, 13, 7

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