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What is the unit digit of $637 4^{1793} \times 62 5^{317} \times 34 1^{491}$ ?

Competition practiceNumber System, HCF & LCM

A5
B4
C2
D0

Step-by-Step Solution

4 to an odd power ends in 4; 625 to any power ends in 5; 341 to any power ends in 1.

4 \times 5 \times 1 = 20

: unit digit 0.

Answer: D) 0

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