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Which sequence shows the first four terms of (a_n=3^n+n)?

Answer and explanation

Correct answer: (4,11,30,85)

For the first four terms, take n=1,2,3,4. Thus, a_1=3^1+1=4, a_2=3^2+2=11, a_3=3^3+3=30, and a_4=3^4+4=85. Therefore, the correct sequence is (4,11,30,85). Option B contains only powers of 3 and does not add n. Exam tip: evaluate 3^n first and then add n for each term.

Related tags

SequencesSequence FormulaFirst Four TermsExponential SequenceSequences And ProgressionsMathematicsClass 9 Mcq

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