If P(A) = 4/ 5 , and P(A ∩ B) = 7/ 10 , then P(B | A) is equal to
1/ 10
17/ 20
1/8
7 /8
2. Multiple Choice
3 minutes
1 pt
If P(A ∩ B) = 7/ 10 and P(B) = 17/ 20 , then P (A | B) equals to
7 /8
1/ 8
17/ 20
14/17
3. Multiple Choice
3 minutes
1 pt
If P(A) = 3/ 10 , P (B) = 2/ 5 and P(A∪B) = 3/ 5 , then P (B | A) + P (A | B) equals to
1/ 4
1/ 3
7/ 12
5/ 12
4. Multiple Choice
3 minutes
1 pt
Two cards are drawn from a well shuffled deck of 52 playing cards with replacement. The probability, that both cards are queens is
2/13
1/169
2/221
1/221
5. Multiple Choice
3 minutes
1 pt
Eight coins are tossed together. The probability of getting exactly 3 heads is
1/ 256
3 /32
7/ 32
5/ 32
6. Multiple Choice
3 minutes
1 pt
Eight coins are tossed together. The probability of getting exactly 3 heads is
1/ 256
3 /32
7/ 32
5/ 32
7. Multiple Choice
3 minutes
1 pt
From a pack of 52 cards, two cards are drawn together, what is the probability that both the cards are kings
2/121
1/221
2/221
1/169
8. Multiple Choice
3 minutes
1 pt
A speaks truth in 75% of cases and B in 80% of cases. In what percentage of cases are they likely to contradict each other, narrating the same incident
30%
40%
45%
35%
9. Multiple Choice
3 minutes
1 pt
A box contains 5 green, 4 yellow and 3 white balls. Three balls are drawn at random. What is the probability that they are of same colour.
52/55
3/55
41/44
3/44
10. Multiple Choice
3 minutes
1 pt
A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective is
7/19
6/19
5/19
4/19
11. Multiple Choice
3 minutes
1 pt
In a college, 30% students fail in physics, 25% fail in mathematics and 10% fail in both. One student is chosen at random. The probability that she fails in mathematics if she has failed in Physics is