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Number Riddle

Braingle.com on

Published in Brain Teasers

It's always 1 to 6,
it's always 15 to 20,
it's always 5,
but it's never 21,
unless it's flying.
What is this?


Solution:

It's a die.

"It's always 1 to 6": the numbers on the faces of the die,
"it's always 15 to 20": the sum of the exposed faces when the die comes to rest after being thrown,
"it's always 5": the number of exposed faces when the die is at rest,
"but it's never 21": the sum of the exposed faces is never 21 when the die is at rest,
"unless it's flying": the sum of all exposed faces when the die is flying is 21 (1 + 2 + 3 + 4 + 5 + 6).

Today's brain teaser courtesy of Braingle.com.


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