Maths / Arithmetic Progression / Sum of First n Terms

QUESTION
 

If large n^t^h term of an AP is 5 + 2n, find the sum of the first 20 terms of the AP.

EXPLANATION
Explain TypeExplanation Content
Text

a_n = 5 + 2n

a_1 = 5 + 2 = 7

a_2 = 5 + 2 X 2 = 9

d = a_2 - a_1 = 9 - 7 = 2

S_2_0 = 10[14 + 19 x 2]

= 10(14 + 38) = 520

 

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