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In an arithmetic progression, (d=9) and the second term is (20). What is the first term?

Answer and explanation

Correct answer: \(11\)

In an AP, the second term is \(a_2=a_1+d\). Therefore, \(a_1=a_2-d=20-9=11\). Hence, the first term is \(11\). The value \(20\) is the second term, not the first term. Exam tip: To find the first term from the second term, subtract the common difference.

Related tags

Arithmetic ProgressionCommon DifferenceFirst TermAp FormulasClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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