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Which value fills the blank in (150,\Box,126,114,102)?

Answer and explanation

Correct answer: 138

This is a decreasing sequence in which each term is 12 less than the previous term: \(150-12=138\) and \(138-12=126\). Therefore, the missing value is 138. Choosing 136 would make the difference from 150 equal to 14, so it would not fit the common-difference pattern. Exam tip: In a missing-term sequence, compare consecutive known terms to identify the rule.

Related tags

SequencesMissing TermArithmetic ProgressionCommon DifferenceDecreasing SequenceSequences And ProgressionsMathematicsClass 9 Mcq

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