Question

which is the biggest black hole in the world

Answer 1

HI FREIND,,,,
Here's Your Answer......
Largest supermassive Black Hole in the nearby universe yet found, is that of the supergiant elliptical galaxy NGC 4889, with a mass of 2.1×1010 (21 billion) M at a distance of 336 million light-years away in the Coma Berenices constellation......
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Answer 2

actually the biggest black hole is not found yet