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QUESTION
Q
Thirty days are in September, April, June and November. Some months are of thirty one days. A month is chosen at...
Thirty days are in September, April, June and November. Some months are of thirty one days. A month is chosen at random. Then its probability of having exactly three days less than maximum of 31 is ?
A
None of these
B
1
C
1/12
D
3/48
E
15/16
A
None of these
B
1
C
1/12
D
3/48
E
15/16
Solution
Three days less than maximum of 31 is = 31 − 3 = 28The only month which has 28 days is February (since non-leap...
Three days less than maximum of 31 is = 31 − 3 = 28
The only month which has 28 days is February (since non-leap year).
Probability of choosing February is = 1/12
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