First slide

Introduction to probability

Question

If any four numbers are selected and they are multiplied, then the probability that the last digit will 1,3,5 or 7 is

Moderate

A

4/625
B

8/625
C

16/625
D

None of these

Solution

The total number of ways = 6³ =216
If the second number is i (i > 1 ), then the total number
of favorable ways $= \sum_{i = 1}^{5} (i - 1) (6 - i) = 20$
.', Required probability $= \frac{20}{216} = \frac{5}{54}$

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