Multiple choice

What is the digit in the unit place of the number [(57)25 + 1]?

  1. 5

  2. 8

  3. 7

  4. 6

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unit's digit in 571 = 7 Unit's digit in 572 = 9 Unit's digit in 573 = 3 Unit's digit in 574 = 1 Unit's digit in 575 = 7 => Digit is repeated in (4n+1) terms, where n = 1, 2. 3, 4......... => In 5725 i.e. 57(4*6+1), the unit's digit is 7 Thus, required digit = 7 + 1 = 8 So, option (2) is correct.

Keep practicing — related questions