One of the most important and exam oriented question from Chapter name- Arithmetic Progression
Class 10th
Chapter number- 9
Exercise :- 9.1
We have to find the first term of given AP where we have nth term as 3ⁿ of that series.
CBSE DHANPAT RAI publication
Understanding CBSE Mathematics
Question 1 (iii)
Given:
By putting n = 1, 2, 3, 4, 5 we get first five term of the sequence
a1 = 31 = 3;
a2 = 32 = 9;
a3 = 33 = 27;
a4 = 34 = 81;
a5 = 35 = 243.
∴ The first five terms are 3, 9, 27, 81, 243.