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What is the (8)th term of (3,6,10,15,21,\ldots)?

Answer and explanation

Correct answer: 45

The successive differences are 3, 4, 5, 6, and so on. Therefore, adding 7 to 21 gives the sixth term 28; adding 8 gives the seventh term 36; and adding 9 gives the eighth term 45. Hence, 45 is correct. Note that 36 is the seventh term, not the eighth. Exam tip: For such sequences, first identify the pattern in the consecutive differences.

Related tags

SequencesSuccessive DifferencesNumber PatternsNth TermArithmetic ReasoningSequences And ProgressionsMathematicsClass 9 Mcq

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