Question
What is the unit digit in (6324)1797 x (615)316 x (341)476 ?
Answer: Option D
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Unit digit in (6324)1797 = Unit digit in (4)1797 = Unit digit in [(42)898 x 4]
= Unit digit in [16898 x 4] = Unit digit in (6 x 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 x (625)316 x (341)476 = Unit digit in [4 x 5 x 1] = 0
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