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A basket contains 4 red, 5 blue and 3 green marbles. If 2 marbles are drawn at random from the basket, what is the probability that both are red? `3/7` (b) `1/2` (c) `1/(11)` (d) `1/6` (e) None of these

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RS AGGARWAL-PROBABILITY-All Questions
  1. In a box, there are 8 red, 7 blue and 6 green balls. One ball is picke...

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  2. A box contains 4 red, 5 green and 6 white balls. A ball is drawn at...

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  3. A basket contains 4 red, 5 blue and 3 green marbles. If 2 marbles a...

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  4. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If two...

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  5. A basket contains 6 blue, 2 red, 4 green and 3 yellow balls. If thr...

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  6. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If thr...

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  7. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If fou...

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  8. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If two...

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  9. A basket contains 6 blue, 2 red, 4 green and 3 yellow balls. If two...

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  10. A basket contains 4 red, 5 blue and 3 green marbles. If three marbl...

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  11. An urn contains 6 red, 4 blue, 2 green and 3 yellow marbles. If 4 m...

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  12. A basket contains 6 blue, 2 red, 4 green and 3 yellow balls. If 5 b...

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  13. An urn contains 2 red, 3 green and 2 blue balls. If 2 balls are dra...

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  14. A box contains 10 black and 10 white balls. What is the probability...

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  15. A box contains 20 electric bulbs, out of which 4 are defective. Two...

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  16. In a class,there are 15 boys and 10 girls.Three students are selected ...

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  17. Four persons are selected at random out of 3 men, 2 women and 4 chi...

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  18. Two dice are tossed. The probability that the total score is a prim...

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  19. In a class, 30% of the students offered English, 20% offered Hindi ...

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  20. A husband and wife appear in an interview for two vacancies in the sam...

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