The first term of an arithmetic progression is -20 and the common difference is 5 . Find the sum of the first 20 terms of the progression. ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . It is given that the sum of the first $$\(2 k\)$$ terms is 10 times the sum of the first $$\(k\)$$ terms.
Exam No：9709_w24_qp_12 Year：2024 Question No：2(a)
Answer:
Knowledge points:
1.6.3 use the formulae for the nth term and for the sum of the first n terms to solve problems involving arithmetic or geometric progressions (Including knowledge that numbers a,b,c are 'in arithmetic progression' if 2 b=a+c (or equivalent) and are 'in geometric progression' if (or equivalent) (Questions may involve more than one progression.)
Solution:
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