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If f(x) = x^(3) + 4x^(2) + lambda x + 1 ...

If `f(x) = x^(3) + 4x^(2) + lambda x + 1` is a monotonically decreasing function of x in the largest possible interval (-2, -2/3). Then

A

a) `lambda = 4`

B

b) `lambda = 2`

C

c) `lambda = -1`

D

d) `lambda` has no real value

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The correct Answer is:
A
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