Which one of the following pairs is not correctly matched ?

PYQ UPPSC LT Grade (Assistant Teacher) 2025

1. A.

   If a + b = 15, then (a – 10)3 + (b – 5)3 = 0

2. B.

   If a + b = 8 and ab = 10, then a3 + b3 = 272

3. C.

   If a + b = 15 and ab = 14, then |a − b| = 13

4. D.

   If a – b = 4 and ab = 2, then a3 – b3 = 80

Attempted by 9 students.