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In a class of 25 students with roll num...

In a class of 25 students with roll numbers 1 to 25 , a students is pecked up at random to answer a question .Find students with roll numbers 1 to 25 , a student is picked up at random to answer a question . Find the probability that roll number of the selected students is either a multiple of 5 or 7.

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The correct Answer is:
`(8)/(25)`
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ICSE-PROBABILITY -EXERCISE 22 (F)
  1. In a single throw of two dice , what is the probability of obtaining a...

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  2. In a group there are 2 men and 3 women ,3 persons are selected at rand...

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  3. In a class of 25 students with roll numbers 1 to 25 , a students is p...

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  4. If chance of A , winning a certain race be (1)/(6) and the chance of B...

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  5. Discuss and critise the following : P(A)=(2)/(3),P(B)=(1)/(4),P(C )=(1...

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  6. E and F are two events associated with a random rxperiment for which ...

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  7. Two events A and B have probabilities 0.25 and 0.50 respectively.The p...

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  8. The probability of an event A occuring is 0.5 and of B is 0.3 If A and...

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  9. A box contains 25 tickets numbered 1 to 25 Two tickets are drawn at ra...

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  10. A bag contains 7 white, 5 black and 4 red balls. Four balls are drawn ...

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  11. A and B are two mutually exclusive events of an experiment: If P(not A...

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  12. A and B are three mutually exclusive events . If P(A)=0.5and P(overli...

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  13. A,B and C are three mutually exclusive events associated with a rando...

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  14. An experiment yields 3 mutually exclusive and exclusive events A, B an...

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  15. In a single throw of two dice, find the probability that neither a ...

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  16. Two unbiased dice are thrown . Find the probability that the sum of th...

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  17. Two dice are thrown together , what is the probabability that the sum ...

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  18. In a given race , the odds in favour of horses A,B,C and D are 1 : 3 ,...

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  19. 100 students appeared for two examinations .60 passed the first , 50 p...

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  20. A card is drawn from a deck of 2 cards. Find the probability of get...

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