If the first, second and last terms of an A.P. be \[a,\ b,\ 2a\] respectively, then its sum will be

If the first, second and last terms of an A.P. be \[a,\ b,\ 2a\] respe

1.	If the first, second and last terms of an A.P. be \[a,\ b,\ 2a\] respectively, then its sum will be
A.	\[\frac{ab}{b-a}\]
B.	\[\frac{ab}{2(b-a)}\]
C.	\[\frac{3ab}{2(b-a)}\]
D.	\[\frac{3ab}{4(b-a)}\]
Answer» D. \[\frac{3ab}{4(b-a)}\]

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If the first, second and last terms of an A.P. be \[a,\ b,\ 2a\] respectively, then its sum will be

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