ProbabilityHard
Question
If 4 whole numbers taken at random are multiplied together, then the chance that the last digit in the product is 1, 3, 7 or 9 is:
Options
A.16/625
B.4/125
C.8/81
D.none
Solution
At end of any number there could be 10 possible digits n (S) = 10 × 10 × 10 × 10 to get last digit of product 1, 3, 7 or 9, end place should be occupid by these digits only
Hence n (E) = 44 P =
Hence n (E) = 44 P =
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