The sum of $n$ terms of the series $1+2+5+12+25+46+\ldots$ is

$\frac{1}{24} n(n+1)\left(n^2-3 n+8\right)$

JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

1 Medium

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Application +4 | -1

The sum of

n

terms of the series

1+2+5+12+25+46+\ldots

View answer and explanation

Correct option: C

\frac{1}{12} n(n+1)\left(n^2-3 n+8\right)

Option C (

\frac{1}{12} n(n+1)(n^2-3 n+8)

) is correct because the sum of n terms of the series is derived to be in this form by finding the nth term and summing it.

Practice All Chapter MCQs →

A=\{1,2,3\}, B=\{3,4\}, C=\{4,5,6\}

{A} \cup({B} \cap {C})

A-(B \cap C)

(B \cup C)-A

a,b,c

a,x,b

b,y,c

{x^2},{b^2},{y^2}

P(x)=1-x+x^2-x^3+\ldots+x^{2012}

y

Q(y)=a_0+a_1 y+\ldots+a_{2012} y^{2012}

y=x-2

\sum\limits_{{i=0}}^{2012} a_i

\log \left(\frac{5 c}{a}\right), \log \left(\frac{3 b}{5 c}\right)

\log \left(\frac{a}{3 b}\right)

A P

a, b

G P

a, b, c

\frac{3}{4}