Puzzle 25
What number comes next in this sequence:
1 · 2 · 6 · 24 · 120 · ?
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Answer
720.
Each term is a factorial, 6! = 1 x 2 x 3 x 4 x 5 x 6 = 720.
Puzzle 26
Which is larger:
centimetres in a mile
miles travelled by light in a second
Puzzle Copyright © Kevin Stone
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Hint
Light travels over 186,000 miles each second.
Answer
Miles travelled by light in a second.
Reasoning
Light travels over 186,000 miles per second.
There are 2.54cm in an inch, 12 inches in a foot, 3 feet in a yard, and 1760 yards in a mile. So there are 2.54 x 12 x 3 x 1760 = 160,934.4cm in a mile.
Puzzle 27
What is so unusual about this sentence:
The quick brown fox jumps over the lazy dog.
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Hint
Look at the letters in the sentence.
Answer
It is a very short sentence in the English language that includes every letter of the alphabet.
Puzzle 28
Can you draw a continuous line that goes through every number in order, starting with 1, and ending with 6?
You can only move horizontally and vertically, every square must be visited, and the line must not cross itself.
Note: this puzzle is not interactive, and the numbers cannot be clicked.
Puzzle Copyright © Cihan Altay
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Hint
From the 1 go straight down.
Answer
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