Teaching CG TET Paper 1 & 2 Mock Test 2024 Mathematics Sequences and Series Arithmetic Progressions

If the first, second and last term of an A.P. are a, b and 2a respectively, its sum is

1
\(\rm \frac{ab}{2(b-a)}\)
2
\(\rm \frac{ab}{(b-a)}\)
3
\(\rm \frac{3ab}{2(b-a)}\)
4
None of these
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