[186] 121, 143, 165, 186, 209

For Competitive Exams

10th CBSE Maths

121, 143, 165, 186, 209

143

165

186

209

Explanation:
Each term in the series is obtained by adding 22 to the preceding term.So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.

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