JEE Advanced Model Paper 13 with solutions for online practice

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Question : 55 of 60

Marks: +1, -0

If the solution of the equation

d2x

dt2

+ 4

dx

dt

+ 3x = 0 , given that for t = 0 , x = 0 and

dx

dt

= 12 is in the form x = Ae−3t + Be−t , then

A + B = 0
A + B = 12
|AB| = 36
|AB| = 49

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