Paper 1 · Mathematical Reasoning and Aptitude
Find the missing number in the following series: 13, 32, 24, 43, 35, ?, 46, 65, 57, 76
A45
B52
C54 ✓ Correct
D55
Correct answer: (C) 54 — The missing number is 54, so that is the answer.
Explanation
★The missing number is 54, so that is the answer.
★The series interleaves two patterns in alternate positions.
★The even-position terms are 32, 43, ?, 65, 76, each rising by 11.
★The missing term is the sixth, which is an even position.
★So it is 43 plus 11.
★This gives 54.
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