Discussion
Find out the wrong number in the given sequence of numbers 6, 13, 18, 25, 30, 37, 40
Answer: D
The differences alternate between \( +7 \) and \( +5 \).
\[ 6 \xrightarrow{+7} 13 \xrightarrow{+5} 18 \xrightarrow{+7} 25 \xrightarrow{+5} 30 \xrightarrow{+7} 37 \xrightarrow{+5} 42 \]
The last term should be \( 37 + 5 = 42 \), not 40.
So 40 is the wrong number.
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