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What is distance of quasar from which li...

What is distance of quasar from which light takes 5 billion years to reach us ?

A

4.73 xx 10^(20) km`

B

4.73 xx 10^(22) km`

C

7.34 xx 10^(20) km`

D

7.34 xx 10^(22) km`.

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