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Q.

If the function f:(−∞,∞)→B  defined by f(x)=−x2+6x−8  is bijective, then B =

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a

[1,∞)

b

(−∞,1]

c

(−∞,∞)

d

[∞,−∞]

answer is B.

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Detailed Solution

f(x)=−x2+6x−8 =1−(x-3)2≤1Codomain B = range =(−∞,1]
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