The value of (1018)2 − 1019 × 1017 + 1015 × 1012 − 1016 × 1011 is:
Answer & explanation
Correct answer: option 4
Do this question with unit digit concept for saving time because all the numbers are near to 1000
82 - 9 × 7 + 5 × 2 - 6 × 1
= 4 - 3 + 0 - 6 = -5
10 - 5 = 5
The answer has unit digit of 5.
Hence, option 4 is correct.