CAT 2023 Progression Question (Medium)

Question

If in a decreasing AP, sum of all the terms except the first term is 75 while the sum of all the terms is 0. If the difference between the 9th term and the 13th term is 20, the find the first term of the AP?

Optima Learn · Accepted Answer

Understanding Let the AP have first term a1 and common difference d d 0, since it s decreasing , with n terms. Analyzing Sum of all terms except the first -75, and sum of all terms 0. So a1 sum of all terms - sum of all terms except first 0 - -75 75. Solving a9 - a13 a1 8d - a1 12d -4d. Given this e

CAT 2023 Progression — Previous Year Question

CAT 2023

Quantitative

Progression

Medium

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