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If `f(x)` continuous on its domain, where `f(x)={:{(6", for " x le 2), (ax+b", for " 2 lt x lt 10),(22", for " x ge 10):}`, then

A

`a=3,b=1`

B

`a=2, b=-1`

C

`a=3,b=-1`

D

`a=2,b=2`

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The correct Answer is:
D
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