If the function f:R to R given by f...

If the function `f:R to R ` given by
`f(x)={(x+a"," , "if "x le 1),(3-x^(2)",","if " x gt1):}` is continuous at x = 1, then a is equal to

A

4

B

3

C

2

D

1

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The correct Answer is:

D

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