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KCET2012MathematicsBinomial Theorem

The last digit of number 7⁸⁸⁶ is

Options

  1. A9
  2. B7
  3. C3
  4. D1

Correct answer

A. 9

Step-by-step solution

Since, 7¹=77²=49,7³=343,7⁴=2401 7⁸⁸⁶= (7⁴ )²²¹ 7² The last digit number 7⁸⁸⁶ is 9 .

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