Discussion
Find out the wrong number in the given sequence of numbers. 8, 13, 21, 32, 47, 63, 83
Answer: A
The differences should grow by 3 each time.
\[ 8 \xrightarrow{+5} 13 \xrightarrow{+8} 21 \xrightarrow{+11} 32 \xrightarrow{+14} 46 \xrightarrow{+17} 63 \xrightarrow{+20} 83 \]
The fifth term should therefore be \( 32 + 14 = 46 \), not 47.
So 47 is the wrong number. Every later term is consistent with 46, which is what confirms the error sits at that single position.
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