WBJEE 2019 Math Solved Paper

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Question : 53 of 75

Marks: +1, -0

Let a = min{x2 + 2x + 3 : x ∊ R} and b =

lim

θ→0

1−cos‌θ

θ2

. Then

n

∑

r=0

arbn–r is

2n+1−1
3.2n
2n+1+1
3.2n
4n+1−1
3.2n
1
2
(2n+1)

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