Discussion
Find out the wrong number in the given sequence of numbers 36, 54, 18, 27, 9, 18.5, 4.5
Answer: B
The series alternates between multiplying by 1.5 and dividing by 3.
\[ 36 \xrightarrow{\times 1.5} 54 \xrightarrow{\div 3} 18 \xrightarrow{\times 1.5} 27 \xrightarrow{\div 3} 9 \xrightarrow{\times 1.5} 13.5 \xrightarrow{\div 3} 4.5 \]
The sixth term should be \( 9 \times 1.5 = 13.5 \), not 18.5.
So 18.5 is wrong. The final 4.5 confirms it, since \( 13.5 \div 3 = 4.5 \) while \( 18.5 \div 3 \) is not a clean value.
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