JEE MATHEMATICS MCQ: LIMITS

1 Easy

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Application +4 | -1

Let

a=\min \left\{x^2+2 x+3: x \in R\right\}

and

b=\lim \limits_{{\theta \rightarrow 0}} \frac{1-\cos \theta}{\theta^2}

. Then, the value of

\sum\limits_{{r=0}} a^r b^{n-r}

, is

View answer and explanation

Correct option: C

\frac{4^{n+1}-1}{3 \times 2^n}

Option C,

\frac{4^{n+1}-1}{3 \times 2^n}

, is correct because it is the result of simplifying the expression and using the formula for the sum of a geometric series.

More Questions from LIMITS

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\lim \limits_{{x \rightarrow 0}}\left(\frac{1}{x^2}-\operatorname{cosec}^2 x\right)

\lim _{x \rightarrow \frac{\pi}{2}} \frac{\cos x}{(1-\sin x)^{2 / 3}}=

\lim\limits_{h \to 0} 2\left\{ {\frac{{\sqrt 3 \sin \left( {\frac{\pi }{6} + h} \right) - \cos \left( {\frac{\pi }{6} + h} \right)}}{{\sqrt 3 h\left( {\sqrt 3 \cos \,h - \sin \,h} \right)}}} \right\}

\lim \limits_{{x \rightarrow \infty}} x\left(e^{1 / x}-1\right)

f(x)=\frac{(x+1)^7 \sqrt{1+x^2}}{\left(x^2-x+1\right)^6}

f^{\prime}(0)

\lim\limits_{n \to \infty } {\left( {1 + \sin \frac{a}{n}} \right)^n}