A) $ 5\times 10^{9} $
B) $ 5.35\times 10^{9} $
C) $ 7.5\times 10^{9} $
D) $ 6\times 10^{9} $
Correct Answer: C
Total population of the world till the end of 20th century will become 7.5×109 = 750 crore.
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