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Q.

If  f(x)=x3x2f'(1)+xf''(2)f'''(3),  xR,  then

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a

3f(1)+f(2)=f(3)

b

f(1)+f(2)+f(3)=f(0)

c

f(3)f(2)=f(1)

d

2f(0)f(1)+f(3)=f(2)

answer is B.

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Detailed Solution

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Let  f(x)=x3+bx2+cx+d

f1(x)=3x2+2bx+c   f11(x)=6x+2b    f111(x)=6 

Given,  f(x)=x3x2f1(x)+xf11(2)f111(3)

x3+bx2+cx+d=x3x2(3+2b+c)+x(12+2b)6

By comparing coefficients
- b = 3 + 2b + c           c = 12 + 2b        
-3 = 3b + c ......(1)        2b – c = -12   .......(2)
Eq. (1) & (2)
3b+c=3          2bc=12

----------------
5b = -15
b = -3, c = 6, d = -6
 f(x)=x33x2+6x6
From option 2
2f(0) – f(1) + f(3) = f(2)
2(-6) – (-2) + 12 = 2

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