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Sum of first and 25th terms of an arithmetic sequence is 70.
(i) What is the sum of 4th and 22nd terms of this sequence ?
Sum of first and 25th terms of an arithmetic sequence is 70.
(i) What is the sum of 4th and 22nd terms of this sequence ?
(i) What is the sum of 4th and 22nd terms of this sequence ?
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Remembering the property ap + aq = aᵣ + aₛ if p+q=r+s makes this problem a simple observation. It saves a lot of time compared to expanding the terms using the aₙ formula.
Updated On: Mar 16, 2026
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