JEE MATHEMATICS MCQ: SEQUENCE OF SERIES

1 Easy

1 of 1

Analyzing +4 | -1

Let

S = 2 + \frac{6}{7} + \frac{{12}}{{{7^2}}} + \frac{{20}}{{{7^3}}} + \frac{{30}}{{{7^4}}} + \ldots

Then

4 S

is equal to

View answer and explanation

Correct option: C

{\left( {\frac{7}{3}} \right)^3}

The correct answer is C (

{\left( {\frac{7}{3}} \right)^3}

) because it is the value of 4S calculated by manipulating the series and using the formula for the sum of an infinite geometric series.

More Questions from SEQUENCE OF SERIES

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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}