What is the unit digit in the product (365 x 659 x 771)?

Question:
What is the unit digit in the product (365 x 659 x 771)?

[A].

1

[B].

2

[C].

4

[D].

6

Answer: Option C

Explanation:

Unit digit in 34 = 1 Unit digit in (34)16 = 1

Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3

Unit digit in 659 = 6

Unit digit in 74 Unit digit in (74)17 is 1.

Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3

Required digit = Unit digit in (3 x 6 x 3) = 4.