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If (a=4) and (a+d=13), what is the value of (d)?
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Answer and explanation
Correct answer: \(9\)
Given \(a=4\) and \(a+d=13\). Thus, \(4+d=13\), so \(d=13-4=9\). In an AP, \(d\) is the common difference. \(13\) is the second term here, not the common difference. Exam tip: when \(a+d\) is given, subtract \(a\) from it to find \(d\).
Frequently asked questions
What is the correct answer to this question?
\(9\)
Why is this the correct answer?
Given \(a=4\) and \(a+d=13\). Thus, \(4+d=13\), so \(d=13-4=9\). In an AP, \(d\) is the common difference. \(13\) is the second term here, not the common difference. Exam tip: when \(a+d\) is given, subtract \(a\) from it to find \(d\).
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Arithmetic Progressions (AP). Topic: Introduction to APs and common difference..
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