Question

In the game of dominoes, each piece is marked with two numbers. The pieces are symmetrical so that the number pair is not ordered (so, for example, (2,6) = (6,2)). How many different pieces can be formed using the numbers 1,2,...,n? (Answer: n(n + 1)/2)

          In the game of dominoes, each piece is marked with two numbers. The pieces are symmetrical so that the number pair is not ordered (so, for example, (2,6) = (6,2)). How many different pieces can be formed using the numbers 1,2,...,n?
(Answer: n(n + 1)/2)

In the game of dominoes, each piece is marked with two numbers. The pieces are symmetrical so that the number pair is not ordered (so, for example, (2,6) = (6,2)). How many different pieces can be formed using the numbers 1,2,...,n?
(Answer: n(n + 1)/2)

Added by Derek W.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Narendra Kumar

02/14/2022

Step 1

This means that for each pair of numbers (a, b), there is also a corresponding pair (b, a) on the domino set. Show more…

Show all steps

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In the game of dominoes, each piece is marked with two numbers. The pieces are symmetrical so that the number pair is not ordered (so, for example, (2,6) = (6,2)). How many different pieces can be formed using the numbers 1,2,...,n? (Answer: n(n + 1)/2)