SPM Practice 1 (Arithmetic Progression) :Question 2

Question 2:
The first three terms of an arithmetic progression are 2k, 3+ 3, 5+ 1. Find
(a) the value of k,
(b the sum of the first 15 terms of the progression.

[ Remember if a, b , c are three consecutive term of arithmetic progression, then c – b = b – a ]

Solution:
)

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