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if f ' (x)= (x-a) 8 (x-b) 11 then a)x=b is a point of minimum b)x=b is a point of maximum c)x=b is a point having neither minimum nor maximum d)f ' (b)>0

if f ' (x)= (x-a)(x-b)11 then 
 
a)x=b is a point of minimum
b)x=b is a point of maximum
c)x=b is a point having neither minimum nor maximum
d)f(b)>0

Grade:12

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