Select the option that is related to the third number in the same way as the second number is related to the first number.
19 : 400 :: 24 : ..........
As per the question,
19 : 400 :: 24 :?
Now we can see that, 19 is related with 400 as - $$ (19+1)^2=400$$
Similarly
24 is related with the next number as - $$(24+1)^2=25^2=625$$
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