Discussion
The numbers attached to these letters shrink at a constant ratio. Complete the sequence.
A64, B32, C16, D8, ?
Answer: C
Correct answer: E4
The letters advance one place at a time while the numbers are halved at each step: 64, 32, 16, 8. Half of 8 is 4, so the term is E4. Halving series are read most easily from the right-hand end, where the numbers are small and the relationship is obvious. E6 comes from subtracting a constant, which fits no pair in the series. Halving series are read most easily from the small end, where 8, 4 and 2 make the relationship plain even if the larger terms do not.
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