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If (5-2t, 7-t, 12+t) are in an arithmetic progression, what is the value of (t)?

Answer and explanation

Correct answer: -3

In an arithmetic progression, the differences between consecutive terms are equal. The first difference is \((7-t)-(5-2t)=t+2\), and the second difference is \((12+t)-(7-t)=5+2t\). Thus, \(t+2=5+2t\), which gives \(t=-3\). Substituting \(-2\) does not make the two differences equal. Exam tip: for three AP terms, you can also check whether twice the middle term equals the sum of the first and third terms.

Related tags

Arithmetic ProgressionCommon DifferenceLinear EquationsClass 10 MathematicsAp TermsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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