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Q.

Let β=limx0αxe3x1αxe3x1 for some α. Then the value of α+β is :

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a

52

b

72

c

145

d

32

answer is C.

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Detailed Solution

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β=limx0αxe3x1αxe3x1

β=limx01+αx1+3x+9x22!+..(αx)e3x13x3xβ=limx0(αx3x)9x22!3αx2

For existence of limit α3=0

α=3

Limit β=32α

β=-12

Now, 

α+β=52

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