![]() ![]() ![]() So, to find the n th term of an arithmetic progression, we know a n = a 1 + (n – 1)d. Derivation of Arithmetic Progression FormulaĪrithmetic progression is a progression in which every term after the first is obtained by adding a constant value, called the common difference (d). But the above formulas are useful when n is a larger value. This could be calculated manually as n is a smaller value. Kevin in the first three years is as follows. We can get the same answer by general thinking also as follows: The annual amount earned by Mr. Substituting these values in the AP sum formula, We have to calculate his earnings in the 3 years. Kevin for the first year is, a = 4,00,000. Then how much does he earn at the end of the first 3 years? Kevin earns $400,000 per annum and his salary increases by $50,000 per annum. ![]()
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