Mathematics - Sequence & Series Question with Solution | TestHub

MathematicsSequence & SeriesSpecial sequences/seriesMedium2 minQB

MathematicsMediumsingle choice

Find the twentieth term of $2, 9, 20, 35, 54, \dots$ .

Answer:

Solution:

The successive differences $7, 11, 15, 19, \dots$ increase by 4 , giving $t_{n} = 2 n^{2} + n - 1; t_{20} = 819$ .

Stream:JEESubject:MathematicsTopic:Sequence & SeriesSubtopic:Special sequences/series

⏱ 2mℹ️ Source: QB

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