A) \[\frac{2}{5}\]
B) \[\frac{1}{5}\]
C) \[\frac{4}{5}\]
D) \[\frac{3}{5}\]
Correct Answer: A
Solution :
(a): If a number ends with an odd number, then it is odd number, find the number of 3 digit odd numbers formed by using the digits 3, 4, 7, 8 and 2, find the total number of 3 digit numbers formed by using the digits 3. 4, 7, 8 and 2. In the box notation, odd numbers can be formed in the following ways:| Hundred | Ten | Unit | ||
| Odd nos. | 3 ways | 4 ways | 2 ways | \[2\times 3\times 4\] |
| Total nos. | 3 ways | 4 ways | 5 ways | \[5\times 4\times 3\] |
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