JEE Delight: In an AP, find the difference of the mean of their squares and the square of their mean

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JEE Delight: In an AP, find the difference of the mean of their squares and the square of their mean Support the channel:
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I was going in the right direction but when it came to taking the difference, I backed off. This is a very big problem with me, I apply the right concepts but when it becomes lengthy or calculative, I back off…

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