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In the sequence (15, 12, 7, 0, -9, ...), the differences are (-3, -5, -7, -9, ...). What will be the next term?

Answer and explanation

Correct answer: -20

The governing idea is to inspect the successive differences rather than assume that the sequence has a constant common difference. The listed differences are -3, -5, -7, and -9; each new difference is 2 smaller than the preceding one. Therefore, the next difference must be -11. The last known term is -9, so the next term is obtained by adding this next difference: -9 + (-11) = -20. Hence option D is correct. Option C would result from using -9 again or making an arithmetic mistake, while the positive options ignore that the sequence is continuing downward. The pattern of odd negative differences confirms the result.

Related tags

SequencesRecursive-RuleNegative-DifferencesClass-9Recursive RuleSequences And ProgressionsMathematicsClass 9 Mcq

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