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What are the first four terms formed by (a_n=2n-1)?

Answer and explanation

Correct answer: (1, 3, 5, 7)

For the first four terms, substitute n=1, 2, 3, and 4. This gives a₁=2(1)-1=1, a₂=3, a₃=5, and a₄=7. Hence, the sequence is (1, 3, 5, 7). Option (2, 4, 6, 8) is the sequence of even numbers, so it does not follow the given rule. Exam tip: When finding initial terms from an nth-term rule, usually begin with n=1.

Related tags

SequencesNth TermOdd NumbersArithmetic ProgressionClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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