In following questions, one term in number series is incorrect.
Find out the incorrect number 121, 143, 165, 186, 209

143

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165

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186

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209

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Solution

The correct option is B 186
Each term of the series is increased by 22 to obtain the next term.
So, 186 is wrong and must be replaced by (165 +22) i.e. 187.

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