MRSM Trial 2025 Add Maths Paper 1, Question 1Progressions

Solved on video in English · Form 4, Progressions · 2:09 video

The question

Given that the sum of the first n terms of a progression is Sₙ = 4n + 2n², find the first term of the progression.

Step 1

The first term equals the sum of the first 1 term: T₁ = S₁.

Why this step

Sₙ is a running total. With only one term added, the total is that term itself, so we never need the general term formula.

3 more steps, each with the reason for it, in the full solution

Final answer

a = 6

Where students lose marks

Watch out: write the substitution 4(1) + 2(1)² before stating S₁ = 6. Writing just S₁ = 6 earns no marks.

Watch every step of this question solved on video (2:09), with the reason behind each step and a box that checks your own answer.

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