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Why n-1 is there in the formula a+(n-1)d?why a+d is not there ?why 1 is subtracted from n in the formula of AP why it can't be written as a+d

Answer» Why n-1 is there in the formula a+(n-1)d?why a+d is not there ?why 1 is subtracted from n in the formula of AP why it can't be written as a+d


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