Choose the numeral pair which is odd and different from others.
Question and options
Choose the numeral pair which is odd and different from others.
- 483, 23
- 624, 26
- 1023, 31
- 1368, 38
Answer and explanation
Correct answer: C - 1023, 31
Pattern n x (n-2) = n^2 - 2n: 483 = 23 x 21, 624 = 26 x 24, 1368 = 38 x 36. But 1023 = 31 x 33 = 31^2 + 2 x 31, so (1023, 31) is the odd one.
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