Paper 1 · Mathematical Reasoning and Aptitude
Find the missing number in the following series: 512, 256, 128, ?, 32, 16, 8
A52
B61
C64 ✓ Correct
D56
Correct answer: (C) 64 — The missing number is 64, so that is the answer.
Explanation
★The missing number is 64, so that is the answer.
★Look at how each term relates to the one before it.
★Each term is exactly half of the previous term.
★512 halved is 256, and 256 halved is 128.
★So the term after 128 is 128 divided by 2, which is 64.
★This fits, since 64 halved gives the next term 32.
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