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Arithmetic Progressions
CH05 Question Bank
CBSE_CH05_QUESTION_BANK
Grade 10

Question:

Find the sum of the first $22$ terms of the AP $8, 3, -2, \ldots$

Step-by-Step Solution

Key Concept: Apply the sum formula directly.
$a=8,d=-5,n=22$. $S_{22}=\dfrac{22}{2}[2(8)+(21)(-5)]=11[16-105]$. [1.0 Mark]

$=11(-89)=-979$. [1.0 Mark]

Correct Answer:
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