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Quantitative Aptitude

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Number Systems and Ratio & Proportion

Question
19 out of 30
 

What is the unit digit in {(6374)1793 x (625)317 x (341491)}?

A 0
B 2
C 3
D 5
E None of These
Ans. A Last digit of power of 1 is always 1

Last digit of power of 5 is always 5

Last digits of power of 4 have two cases

If power is even then last digit be 6 while if odd then last digit be 4

So, 4 x 5 x 1 = 20 = 0

Number Systems and Ratio & Proportion Flashcard List

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