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Question

What is the unit digit in (6324)1797 × (615)316 × (341)476 ?
Options:
A .  1
B .  2
C .  4
D .  0
Answer: Option D

Answer : Option D

Explanation :

Unit digit in (6324)1797 = Unit digit in (4)1797 = Unit digit in [(42)898 × 4]
= Unit digit in [16898 × 4] = Unit digit in (6 × 4) = 4
Unit digit in (615)316 = Unit digit in (5)316 = 5
Unit digit in (341)476 = Unit digit in (1)476 = 1
Hence, unit digit in (6324)1797 × (625)316 × (341)476 = Unit digit in [4 × 5 × 1] = 0



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