The number of terms of an A.P. is even; the sum of all the odd terms is , the sum of all the even terms is and the last term exceeds the first by . Then the number of terms which are integers in the A.P. is:
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The number of terms of an A.P. is even; the sum of all the odd terms is , the sum of all the even terms is and the last term exceeds the first by . Then the number of terms which are integers in the A.P. is:
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