RRB Junior Engineer / DMS / CMA 2015 · Question 18 of 480

The first term of an AP is - 5 and third term is 17. Its seventh term is

Mathematics - Progressions

Aa. 31
Bb. 41
Cc. 61Correct
Dd. 71

Answer: C. c. 61

Explanation

Here, a = -5, T3 = 17 Let common difference is o' Tn =a+(n-V0 => T3= 17 = -5+(3-1)cf => 22=2d=>c/=11 Now, I7 = -5 + (7 -1) x 11 = -5 + 66 = 61

Source: Arihant RRB JE Solved Paper 26-Aug-2015 (3rd Shift), Q91–150 — published solved-paper compilation (Q1–90 technical not included in this source) · memory-based

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