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Let a = min {x^(2) + 2x + 3 : x in R} a...

Let a = min `{x^(2) + 2x + 3 : x in R}` and `b = lim_(theta rarr 0)(1-cos theta)/(theta^(2))`. Then `sum_(r = 0)^(n) a^(r)b^(n-r)` is

A

`(2^(n+1) -1)/(3.2^(n))`

B

`(2^(n+1) +1)/(3.2^(n))`

C

`(4^(n+1)-1)/(3.2^(n))`

D

`(1)/(2)(2^(n)-1)`

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2019-MULTIPLE CHOICE QUESTIONS
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