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Question
Which smallest number must be added to 710 so that the sum is a perfect cube ?
Options:
A .  11
B .  19
C .  21
D .  29
Answer: Option B
$$\eqalign{
& {\text{Required number to be added}} \cr
& = {9^3} - 710 \cr
& = 729 - 710 \cr
& = 19 \cr} $$

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