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What will be unit digit in 357 x 641 x 763?

A - 8

B - 9

C - 4

D - 6

Answer - C

Explanation

3
57 = (34)14 x 3 So Unit digit in 357 = Unit digit in 1 x 3 = 3 641 = (64)10 x 6 So Unit digit in 641 = Unit digit in 6 x 6 = 6 763 = (74)15 x 73 So Unit digit in 761 = Unit digit in 1 x 343 = 3 So Unit digit in 357 x 641 x 763 = Unit digit in 3 x 6 x 3 = 4

We've used following formulae here:

Unit digit in 3
4 = 1 Unit digit in 64 = 6 Unit digit in 74 = 1 So Unit digit - in ((3)4)n) will be 1. - in ((6)4)n) will be 6. - in ((7)4)n) will be 1.
asked Jun 4 in apptitute by rajesh | 18 views



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