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Two numbers $a$ and $b$ are chosen are random from a set of the first 30 natural numbers, then the probability that $a^2 - b^2$ is divisible by 3 is




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Aviral Rai-pic
Aviral Rai , student
Commented Apr 28 , 2023
sir ... i think we are missing ;;;;;;;one case in this problem is that the sum of 3,6,9....is also divisible by 3 that is not considered in this case please resolve this issue and reply..thank you

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