Discussion
Find out the wrong number in the given sequence of numbers 1, 2, 6, 15, 31, 56, 91
Answer: B
The differences should be the perfect squares in order.
\[ 1 \xrightarrow{+1} 2 \xrightarrow{+4} 6 \xrightarrow{+9} 15 \xrightarrow{+16} 31 \xrightarrow{+25} 56 \xrightarrow{+36} 92 \]
The last term should be \( 56 + 36 = 92 \), not 91.
So 91 is the wrong number.
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