Numbers - General Aptitude

Q1:

753 x 753 + 247 x 247 - 753 x 247 = ?
753 x 753 x 753 + 247 x 247 x 247

A
1
1000

B
1
506

C
253
500

D None of these

ANS:A -

1
1000

Given Exp. = (a2 + b2 - ab) = 1 = 1 = 1
(a3 + b3) (a + b) (753 + 247) 1000