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If two numbers a and b are-chosen at random from the 1st 30 natural numbers, find the probability that the expresion `(a^2 -b^2) `is divisible by 3.

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 12-EXERCISE
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  11. If two numbers a and b are-chosen at random from the 1st 30 natural nu...

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  12. Find A.M. and SD of the following distribution table :

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