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Solution :

The time taken by light from the quasar to the observer <br> `t = 3.0` billion yesrs `=3.0 xx 10^(9)` years As `1 ly =9.46xx10^(15) m` <br> `:.` Distance of quasar from the observer `d = 3.0xx10^(9) xx9.46xx10^(15) m` <br> `=28.38xx10^(24)m=2.8xx10^(25)m` or `2.8xx10^(22) km`.