Mathematics - Sequence & Series Question with Solution | TestHub

MathematicsSequence & SeriesA.P.Easy2 minPYQ_2020

MathematicsEasysingle choice

A student read common difference of an A. P. as -2 instead of 2 and got the sum of first 5 terms as -5 . Actual sum of first five terms is

Answer:

Solution:

$\frac{5}{2} {2 a + 4 (- 2)} = - 5 \Rightarrow 2 a = 6$ $∴$ Actual sum $= \frac{5}{2} {6 + 4 (2)} = 35$

Stream:BITSATSubject:MathematicsTopic:Sequence & SeriesSubtopic:A.P.

⏱ 2mℹ️ Source: PYQ_2020

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