find The last digit in the product 287 x 287 + 269 x 269 - 2 x 287 x 269?
Choose the correct answer.
A) 5 B) 6 C) 8 D) 9 E) 4

Rationale: explanation : given exp . = a 2 + b 2 - 2 ab , where a = 287 and b = 269 = ( a - b ) 2 = ( 287 - 269 ) 2 = ( 182 ) = 324 answer is e
Answer: E