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The number of seats available for Biology and Computer Science in a school is in the ratio 5:8. They are to be increased by 30% and 25% . Find the new ratio.

A. 6:10
B. 13:20
C. 3:4
D. 35:33

The probability that a number selected at random from the first 50 natural numbers is a composite number is__________?

A. 21/25
B. 17/25
C. 4/25
D. 8/25

A coin is tossed live times. What is the probability that there is at the least one tail?

A. 31/32
B. 1/16
C. 1/2
D. 1/32

If a number is chosen at random from the set {1, 2, 3, …., 100}, then the probability that the chosen number is a perfect cube is___________?

A. 1/25
B. 1/2
C. 4/13
D. 1/10

Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is_____________?

A. 1/2
B. 16/19
C. 4/5
D. 17/20

If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is__________?

A. 1/4
B. 1/2
C. 3/4
D. 3/5

If four coins are tossed, the probability of getting two heads and two tails is__________?

A. 3/8
B. 6/11
C. 2/5
D. 4/5

If a card is drawn from a well shuffled pack of cards, the probability of drawing a spade or a king is__________?

A. 19/52
B. 17/52
C. 5/13
D. 4/13

If six persons sit in a row, then the probability that three particular persons are always together is____________?

A. 1/20
B. 3/10
C. 1/5
D. 4/5

A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.

A. 8/15
B. 2/5
C. 3/5
D. 7/15

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