Sum of first n terms of an AP. Also written as Sₙ = n/2(a + l) where l is the last term.
Gauss's childhood sum — Sum of 1 to 100 = 100×101/2 = 5050.
Total savings — Sum of monthly deposits that increase by a fixed amount.
Stadium seating — Total seats when each row has more seats than the previous.
Loan repayment — Total amount paid with increasing EMIs.
Training programs — Total hours when daily practice increases progressively.
Distance traveled — Object with constant acceleration; sum of distances each second.
Pyramid blocks — Total blocks when each layer has fewer blocks.
Commission calculation — Salesperson with increasing monthly targets.
Fuel consumption — Total fuel used with linearly increasing consumption.
Concert ticket revenue — Different priced rows in a concert hall.
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