Puzzle 197
What comes next in this sequence:
boron · carbon · nitrogen · oxygen · ?
workings
hint
answer
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Hint
The first in the list would be Hydrogen.
Answer
Fluorine.
These are the elements in atomic number order.
Puzzle 198
What are the next two numbers in this sequence:
14 · 91 · 62 · 53 · 64 · 96 · ? · ?
Puzzle Copyright © Kevin Stone
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Hint
Try removing the spaces between the numbers.
Answer
48 and 11.
Reasoning
These are the squares of numbers without the correct spacing.
1 4 9 16 25 36 49 64 81 100
with no spaces becomes:
149162536496481100
broken into blocks of two:
14 91 62 53 64 96 48 11 00
So the next two in the sequence are 48 and 11.
Puzzle 200
What number comes next in this sequence:
7 · 8 · 5 · 5 · 3 · 4 · 4 · ?
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Hint
The answer involves months of the year.
Answer
6.
The number of letters each month has, starting with January, therefore August has 6 letters.
