Mathematics · Arithmetic Progressions · NCERT Examples
Example 3
A complete, independently verified solution for NCERT Example 3.
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Mathematics · Chapter 5 · NCERT Examples
Verified NCERT questions and solutionsSolutions are checked independently and follow the supplied NCERT chapter edition.
NCERT Example
Example 3
Find the 10th term of 2, 7, 12, …
Solution
Board-exam working:
Here a=2 and d=7−2=5.
We need n=10.
a₁₀=a+(10−1)d=2+9×5=2+45=47.
Check: a₉=2+8×5=42 and a₁₁=2+10×5=52, so the difference on both sides is 5.
Final answer
47.