SPM 2019 Add Maths Paper 1, Question 6Progressions

Solved on video in English and Bahasa Melayu · 4 marks · Form 4, Progressions · 3:40 video

The question

The third term of an arithmetic progression is 4 and the fourth term is 7. (a) State the common difference of the progression. (b) Find the sum of the first 25 terms of the progression.

[4 marks]

SPM 2019 Add Maths Paper 1, Question 6: the question as drawn in Eduly's video3:40

Step 1

Let the first term be a and common difference d, so Tn = a+(n-1)d.

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

Final answer

(a) d = 3; (b) S25 = 850

Where students lose marks

Watch out: don't slip when solving for a, and use Sn = n/2 [2a + (n − 1)d], which needs only a and d.

Watch every step of this question solved on video (3:40), with the reason behind each step and a box that checks your own answer.

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