"If we have to take three terms in an AP, it is convenient ti take them as a-d,a,a+d.(adsbygoogle = window.adsbygoogle || []).push({}); In general, we take a-rd,a-(r-1)d,....,a-d,a,a+d, in case we have to take (2r+1) terms in an AP."

What do they mean by the portion in bold?

What is 'r' here ?

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# Progressive terms assumption!

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