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Q: What will be unit digit in (3157)754?

A - 8

B - 9

C - 7

D - 6

Answer - B

Explanation

unit digit in (3157)

754 = unit digit in (7)754 = unit digit in (74)188 x 72 = unit digit in (1 x 49) = 9 Thus Unit digit in (3157)754 is 9.

We've used following formulae here:

Unit digit in 7
1 = 7 Unit digit in 72 = 9 Unit digit in 73 = 3 Unit digit in 74 = 1 Unit digit in 75 = 7 Unit digit in 76 = 9 Unit digit in 77 = 3 Unit digit in 78 = 1 So pattern is 7-9-3-1. This pattern works for all numbers. So Unit digit in ((7)4)n) will be 1.
asked Jun 4 in apptitute by rajesh | 7 views



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