Maths / Arithmetic Progression / Sum of First n Terms

QUESTION
 

Find the sum of the last 20 terms of the following AP: 3, 8, 13, ......... 253

EXPLANATION
Explain TypeExplanation Content
Text

Aa = 253

d = - 5

S_2_0=10[2times 253 +19times(-5)]

       = 10[506 - 95]

       = 4110

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