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Numbers - General Aptitude

Q1:

What is the unit digit in(795 - 358)?

A 0

B 4

C 6

D 7

ANS:B - 4

Unit digit in 795 = Unit digit in [(74)23 x 73]
= Unit digit in [(Unit digit in(2401))23 x (343)]
= Unit digit in (123 x 343)
= Unit digit in (343)
= 3 Unit digit in 358 = Unit digit in [(34)14 x 32]
= Unit digit in [Unit digit in (81)14 x 32]
= Unit digit in [(1)14 x 32]
= Unit digit in (1 x 9)
= Unit digit in (9)
= 9 Unit digit in (795 - 358) = Unit digit in (343 - 9) = Unit digit in (334) = 4. So, Option B is the answer.