Discussion
Find out the wrong number in the given sequence of numbers. 22, 33, 66, 99, 121, 279, 594
Answer: C
Every term should be a multiple of 11.
\[ 22,\; 33,\; 66,\; 99,\; 121,\; 594 \;\text{are all divisible by 11} \]
\[ 279 \div 11 = 25.36 \ldots \]
So 279 is the wrong number. The alternating-sum test confirms it: \( 2 - 7 + 9 = 4 \), which is not a multiple of 11.
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