Q21
Q21 Two brothers Ram and Ravi appeared for an exam. The probability of selection of Ram is 2/7 and that of Ravi is 1/5. Find the probability that both of them are selected.
2/35
2/3
7/35
5/7
Q22
Q22 A speaks the truth in 75% of cases and B in 80% of cases. In what percent of cases are they likely to contradict each other in narrating the same event?
0.225
0.37
0.32
0.35
Q23
Q23 A family has 3 babies. What is the probability that atleast one of the babies is girl baby ?
7/8
8/7
7/6
6/7
Q24
Q24 Find the probability of getting a numbered card when a card is drawn from the pack of 52 cards.
15/9
9/13
13/9
9/15
Q25
Q25 There are 5 green 7 red balls. Two balls are selected one by one without replacement. Find the probability that first is green and second is red.
35/136
35/132
35/142
35/149
Q26
Q26 Two cards are drawn from the pack of 52 cards. Find the probability that both are diamonds or both are kings.
(13C2 + 4C2 ) / 52C2
(13C2 + 52C2) / 4C2
(4C2+52C2) / 13C2
None of these
Q27
Q27 Three dice are rolled together. What is the probability as getting at least one '4'?
91/216
91/209
91/219
91/222
Q28
Q28 A problem is given to three persons P, Q, R whose respective chances of solving it are 2/7, 4/7, 4/9 respectively. What is the probability that the problem is solved?
122/147
122/149
122/142
122/141
Q29
Q29 Find the probability that a leap year has 52 Sundays.
5/7
7/5
5/9
9/5
