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In a training program, running distance increases by (0.4) km each day. The distances are (1.2,1.6,2.0,2.4,\ldots). What is the difference between the third and first terms?

Answer and explanation

Correct answer: 0.8

The first term is 1.2 km and the third term is 2.0 km. Therefore, the difference is 2.0 - 1.2 = 0.8 km. There are two equal gaps from the first term to the third term, so the difference is 2d = 2 × 0.4 = 0.8. Option 0.4 is only the difference between consecutive terms. Exam tip: In an AP, use aₙ - aₘ = (n - m)d.

Related tags

Arithmetic ProgressionCommon DifferenceTerm DifferenceDecimal ArithmeticGrade 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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