GMAT Arithmetic Progression Sample Question | GMAT 650 to 700 Level Problem Solving Question

Описание: GMAT Online Course | Number Properties Sample Question | Sequences & Series | Problem Solving Practice

A GMAT 650 to 700 Level Sequences & Series Question. We have to find the sum of first 15 terms of an AP.

Question
The sum of fourth and twelfth term of an arithmetic progression is 20. What is the sum of first 15 terms of the arithmetic progression?

A. 300
B. 120
C. 150
D. 170
E. 270

Approach:
Step 1: Simplify the AP summation formula for 15 terms.
Step 2: Relate the missing data in the Summation Formula to the sum of fourth and twelfth term.

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