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If (a=9) and (d=0), what are the first three terms?

Answer and explanation

Correct answer: (9,9,9)

An arithmetic progression is formed by repeatedly adding the same common difference. The first term is \(a=9\), and the common difference is \(d=0\). Therefore the second term is \(9+0=9\), and the third term is again \(9+0=9\). In fact, adding zero never changes a number, so every term of this progression remains 9.

The first option alternates incorrectly, while the second and fourth options show sequences with nonzero changes. The defining feature here is not merely the starting value 9 but the instruction that the difference is zero. Hence the first three terms are \(9,9,9\), which is exactly option C. The supplied answer and the calculation agree.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9Easy

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