Discussion
Find the one which does not belong to that group ?
Answer: C
Three of the four are products of two consecutive integers.
\[ 20 = 4 \times 5, \quad 42 = 6 \times 7, \quad 72 = 8 \times 9 \]
\[ 58 = 2 \times 29 \text{, and } 7 \times 8 = 56, \; 8 \times 9 = 72 \]
So 58 does not belong - it falls between two such products without being one.
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