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Numbers - General Aptitude

Q1:

What is the unit digit in {(6374)1793 x (625)317 x (341491)}?

A 0 

B 2

C 3

D 5

ANS:A - 0 

Unit digit in (6374)1793 = Unit digit in (4)1793     = Unit digit in [(42)896 x 4]     = Unit digit in (6 x 4) = 4 Unit digit in (625)317 = Unit digit in (5)317 = 5 Unit digit in (341)491 = Unit digit in (1)491 = 1 Required digit = Unit digit in (4 x 5 x 1) = 0.