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If (a=15) and (d=0), what are the first three terms?

Answer and explanation

Correct answer: (15,15,15)

In an arithmetic progression, the first term is represented by \(a\), and the common difference \(d\) is added to obtain each next term. If \(a=15\) and \(d=0\), no change occurs when moving from one term to the next. Thus the sequence remains constant rather than increasing or decreasing.

The first term is 15. The second term is \(a+d=15+0=15\), and the third term is \(15+0=15\) again. Therefore, the first three terms are \(15,15,15\), so option C is correct. The general term also confirms this: \(a_n=a+(n-1)d=15+(n-1)0=15\) for every positive integer \(n\). Choices A and B incorrectly change the position of 15, while choice D treats the difference as 15 instead of zero.

Related tags

SequencesProgressionsArithmetic-ProgressionClass-9EasyArithmetic ProgressionSequences And ProgressionsMathematics

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