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If the focii of (x^(2))/(16)+(y^(2))/(4)...

If the focii of `(x^(2))/(16)+(y^(2))/(4)=1` and `(x^(2))/(a^(2))-(y^(2))/(3)`=1 coincide, then value of a is

A

`sqrt(3)`

B

`(1)/(sqrt(3))`

C

2

D

3

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