Arithmetic Progressions
CH05 Question Bank
CBSE_CH05_QUESTION_BANK
Grade 10
Question:
If the $3$rd and $9$th terms of an AP are $4$ and $-8$ respectively, find the common difference.
Step-by-Step Solution
Key Concept: Write both terms using the nth-term formula and subtract to eliminate a.
$a+2d=4$ and $a+8d=-8$. Subtracting: $6d=-12$. [1.0 Mark]
$d=-2$. [1.0 Mark]
Correct Answer:
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