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A plant grows (2) cm every day. The heights are (12,14,16,18,\ldots). What is the height on the fourth day?

Answer and explanation

Correct answer: (18) cm

This is an arithmetic progression with first term (12) and common difference (2). The fourth term is \(a_4=a_1+(4-1)d=12+3\times2=18\) cm, so option C is correct. For exams, remember that finding the fourth term requires adding the common difference three times to the first term, not four times.

Related tags

Arithmetic ProgressionCommon DifferenceTerm PositionWord ProblemFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)Arithmetic Progressions Ap

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