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The sum of first four terms of an A.P. i...

The sum of first four terms of an A.P. is 56 and the sum of it's last four terms 112. If its first term is 11 then find the number of terms in the A.P

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To solve the problem step by step, we will use the properties of an arithmetic progression (A.P.). ### Step 1: Understand the given information We know: - The first term \( a = 11 \) - The sum of the first four terms \( S_4 = 56 \) - The sum of the last four terms \( S_{last4} = 112 \) ...
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