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If (3z, z+10, 22-z) are in an arithmetic progression, what is the first term?

Answer and explanation

Correct answer: No such value of z

For three consecutive terms of an AP, twice the middle term equals the sum of the first and third terms. Thus, \(2(z+10)=3z+(22-z)\). On simplifying, the left side is \(2z+20\) and the right side is \(2z+22\), which gives \(20=22\), an impossibility. Hence, no value of \(z\) satisfies the condition, so the first term cannot be determined. Exam tip: For three AP terms, always check \(2b=a+c\).

Related tags

Arithmetic ProgressionAp ConditionCommon DifferenceClass 10 MathematicsAlgebraic ConsistencyIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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