Select the option that is related to the third number in the same way as the second number is related to the first number.
17 : 306 : : 21 : ?
The product of the first number and (first number+1) will become the second number.
$$17\times18 =Â 306$$
$$21\times22 =Â 462$$
Hence 462 will come in place of the question mark.
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