Invisible Counting

Probability Level 1

You have 2 six-sided dice whose faces are numbered from 1 to 6. You count the number of spots on ALL visible faces, and get a total of 35. What is the sum of spots on the two bottom faces which are invisible?

Clarification: When you roll a dice, there is only 1 face invisible.

6 7 5 8

Chung Kevin by Chung Kevin , 46, Australia

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3 solutions

Jolon Behrent
Oct 23, 2016

A die has 6 sides and the opposite sides add up to 7, therefore, there are 3 sets of 7, so each die adds up to 21.

The total of the 2 dice is 42. As the visible faces add up to 35, we can say that the other sides add up to 7 \boxed{7} (because 42 − 35 = 7 42-35=7 )

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Namita Shukla
Oct 28, 2016

Its an easy one We know that 1±2+3+4+5+6=21 2 dices = 42 Therefore, 42-35=7

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Azadali Jivani
Oct 26, 2016

6+5+4+3+2+1=21
The total of 2 disc = 42
42-35 = 7 (Ans.)

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