Discussion
Find out the wrong number in the series 64, 71, 80, 91, 104, 119, 135, 155
Answer: D
The gaps should be the successive odd numbers.
\[ 64 \xrightarrow{+7} 71 \xrightarrow{+9} 80 \xrightarrow{+11} 91 \xrightarrow{+13} 104 \xrightarrow{+15} 119 \xrightarrow{+17} 136 \xrightarrow{+19} 155 \]
The seventh term should be \( 119 + 17 = 136 \), not 135.
So 135 is wrong - the final 155 confirms it, since \( 136 + 19 = 155 \).
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