Discussion
Find out the wrong number in the given sequence of numbers 125, 127, 130, 135, 142, 153, 165
Answer: D
The differences should be the prime numbers in order.
\[ 125 \xrightarrow{+2} 127 \xrightarrow{+3} 130 \xrightarrow{+5} 135 \xrightarrow{+7} 142 \xrightarrow{+11} 153 \xrightarrow{+13} 166 \]
The last term should be \( 153 + 13 = 166 \), not 165.
So 165 is wrong. The actual last gap is 12, which is not prime.
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