ProbabilityHard
Question
The probability that 4th power of a positive integer ends in the digit 6 is:
Options
A.10 %
B.20 %
C.25 %
D.40 %
Solution
Last place can be occupied by (0 - 9) 10 methods.
to get ′6′ at unit place of x4 Last digit should be 2, 4 ,6 or 8 is 4 ways
⇒ P =
≡ 40%
to get ′6′ at unit place of x4 Last digit should be 2, 4 ,6 or 8 is 4 ways
⇒ P =
≡ 40%Create a free account to view solution
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