2023Q6(ii)(c)Arithmetic Progression

NumericalEasy1 mark

6(ii)

The 5th and 9th term of an Arithmetic Progression are 4 and -12 respectively. Find :

sum of 16 terms of the A.P.

Topic: Arithmetic progression

Previous-year question practice database

Answer

Exam answer

S₁₆ = −160.

Explanation

S₁₆=16/2[2(20)+15(−4)] = 8(−20)=−160.

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