Select the odd word/letters/number/number pair from the given alternatives.
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Select the related word/letters/number from the given alternatives.
56 : 72 : : 90 : ?
BCD : DEG : : FIJ : ?
CGK : DHL : : UYC : ?
Scientist : Laboratory : : Astronomer : ?
What is that least number that must be added to the product 684 × 686 to make it a perfect square?