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Q.

Let f,g:[2,3]R be continuous function which are twice differentiable on the interval (2,3). Let the values of f and g at the points -2, 0, 1 and 3 be as given in the following table:

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In each of the intervals (2,0),(0,1)and(1,3) the function (f5g)" never vanishes. Then the correct statement(s) is (are)

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a

f'(x)5g'(x)=0 has atleast one solution in (1,3)

b

f'(x)5g'(x)=0 has exactly one solution in (0,1)

c

f'(x)5g'(x)=0  has exactly three solutions in (2,0)(0,1)(1,3)

d

f'(x)5g'(x)=0 has atleast two solutions in (2,0)

answer is A, B, C.

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Detailed Solution

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Let  h(x)=f(x)5g(x)
h(x) is continuous, differentiable & f'(x) is
Also, continuous, differentiable
h(2)=6=h(0)=h(1)=h(3)&(f5g)" never vanishes
 Exactly one root in (2,0),(0,1)&(1,3)

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