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Find the unit's digit in the product
(2467)163 x (341)72.

Option:
A. 11
B. 5
C. 3
D. 1
E. 7
Answer: E . 7

Justification:

Clearly, unit's digit in the given product = unit's digit in 7153 x 172.
Now, 74 gives unit digit 1.
7152 gives unit digit 1,
.`. 7153 gives unit digit (1 x 7) = 7. Also, 172 gives unit digit 1.
Hence, unit's digit in the product = (7 x 1) = 7.

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