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Question
If the nth term of an AP is (2n + 1), then the sum of its first three terms is ______.
Options
6n + 3
15
12
21
MCQ
Fill in the Blanks
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Solution
If the nth term of an AP is (2n + 1), then the sum of its first three terms is 15.
Explanation:-
a1= 2 × 1 + 1 = 3,
a2 = 2 × 2 + 1 = 5,
a3 = 2 × 3 + l = 7
∴ Sum = 3 + 5 + 7 = 15
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