# 2003 AIME I Problems/Problem 3

## Problem

Let the set $\mathcal{S} = \{8, 5, 1, 13, 34, 3, 21, 2\}.$ Susan makes a list as follows: for each two-element subset of $\mathcal{S},$ she writes on her list the greater of the set's two elements. Find the sum of the numbers on the list.

## Solution

Order the numbers in the set from greatest to least to reduce error: $\{34, 21, 13, 8, 5, 3, 2, 1\}.$ Each element of the set will appear in $7$ two-element subsets, once with each other number.

• $34$ will be the greater number in $7$ subsets.
• $21$ will be the greater number in $6$ subsets.
• $13$ will be the greater number in $5$ subsets.
• $8$ will be the greater number in $4$ subsets.
• $5$ will be the greater number in $3$ subsets.
• $3$ will be the greater number in $2$ subsets.
• $2$ will be the greater number in $1$ subsets.
• $1$ will be the greater number in $0$ subsets.

Therefore the desired sum is $34\cdot7+21\cdot6+13\cdot5+8\cdot4+5\cdot3+3 \cdot2+2\cdot1+1\cdot0=\boxed{484}$.