Foundation
Mathematics Foundation
nth term of AP
Question
If the nth term of an AP is (2n + 1) then the sum of its first three terms is
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Solution
(T1 + T2 + T3) = (2 × 1 + 1) + (2 × 2 + 1) + (2 × 3 + 1) = 3 + 5 + 7 = 15.