JEE MATHEMATICS MCQ: BINOMIAL THEOREM

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Application +4 | -1

S_n=\sum_{r=0}^n \frac{1}{{ }^n C_r}

and

t_n=\sum_{r=0}^n \frac{r}{{ }^n C_r}

, then

\frac{t_n}{S_n}

is equal to-

View answer and explanation

Correct option: A

\frac{1}{2} \mathbf{n}

Option A (

\frac{1}{2}n

) is correct because by using the property

{ }^n C_r = { }^n C_{n-r}

and summing the series, we can find the ratio

\frac{t_n}{S_n}

More Questions from BINOMIAL THEOREM

Practice All Chapter MCQs →

\left({ }^{10} C_0\right)^2-\left({ }^{10} C_1\right)^2+\ldots-\left({ }^{10} C_9\right)^2+\left({ }^{10} C_{10}\right)^2

a

d

\left( {n + 1} \right)

a{C_0} - \left( {a + d} \right){C_1} + \left( {a + 2d} \right){C_2} - ... + ...

(1-x)^{201}\left(1+x+x^2\right)^{200}

\left(\frac{1}{x}+2 x\right)^n

{x^5}

\frac{{1 + {x^2}}}{{1 + x}},\left| x \right| < 1,

\left(\begin{array}{c}2 n+1 \\ 0\end{array}\right)+\left(\begin{array}{c}2 n+1 \\ 3\end{array}\right)+\left(\begin{array}{c}2 n+1 \\ 6\end{array}\right)+\ldots=170

n