Discussion
Select the relates number from the given alternatives 42 : 56 :: 72 : ?
Answer: B
The related number is 90.
Each number is the product of two consecutive integers: 42 = 6 × 7 and 56 = 7 × 8, so 42 and 56 are consecutive terms of this pattern. Likewise 72 = 8 × 9, and the next term is 9 × 10 = 90.
81 is a square, and 92 and 100 are not products of consecutive integers following 8 × 9.
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