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Cards marked with numbers 1, 2, 3, 4, .....

Cards marked with numbers 1, 2, 3, 4, ..... 20 are well shuffled and a card is drawn at random. What is the probability that the number on the card is :
a prime number ?

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ICSE-PROBABILITY-EXERCISE 25(C)
  1. Two dice are thrown simultaneously. What is the probability that : (...

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  2. Two dice are thrown simultaneously. What is the probability that : (...

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  3. Cards marked with numbers 1, 2, 3, 4, ..... 20 are well shuffled and a...

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  4. Cards marked with numbers 1, 2, 3, 4, ..... 20 are well shuffled and a...

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  5. Cards marked with numbers 1, 2, 3, 4, ..... 20 are well shuffled and a...

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  6. Offices in Delhi are open for five days in a week (Monday to Friday). ...

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  7. Offices in Delhi are open for five days in a week (Monday to Friday). ...

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  8. Offices in Delhi are open for five days in a week (Monday to Friday). ...

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  9. A box contains some black balls and 30 white balls. If the probability...

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  10. From a pack of 52 playing cards, all cards whose numbers are multiples...

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  11. From a pack of 52 playing cards, all cards whose numbers are multiples...

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  12. A dice has 6 faces marked by the given below : 1, 2, 3, -1, -2, -3 ...

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  13. A dice has 6 faces marked by the given below : 1, 2, 3, -1, -2, -3 ...

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  14. A dice has 6 faces marked by the given below : 1, 2, 3, -1, -2, -3 ...

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  15. A bag contains 5 white balls, 6 red balls and 9 green balls. A ball is...

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  16. A bag contains 5 white balls, 6 red balls and 9 green balls. A ball is...

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  17. A bag contains 5 white balls, 6 red balls and 9 green balls. A ball is...

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  18. A game of numbers has cards marked with 11, 12, 13, ..... , 40. A card...

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  19. A game of numbers has cards marked with 11, 12, 13, ..... , 40. A card...

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  20. Sixteen cards are labelled as a, b, c, ......... , m, n, o, p. They ar...

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