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In the sequence (100,96,89,x,66), the differences are (-4,-7,-10,-13). What will (x) be?

Answer and explanation

Correct answer: 79

The consecutive differences are \(-4,-7,-10,-13\). Therefore, adding \(-10\) to the third term gives \(x=89-10=79\). Check: \(79+(-13)=66\), so the next difference is also satisfied. If 76 were chosen, the difference from 89 would be \(-13\), not the required third difference of \(-10\). Exam tip: a negative difference means subtract that value from the preceding term.

Related tags

SequencesMissing TermCommon DifferencesNegative DifferencesClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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