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ICSE Question Bank
2023Q9(ii)Arithmetic Progression
NumericalModerate3 marks

Which term of the Arithmetic Progression (A.P.) 15, 30, 45, 60 ..... is 300 ? Hence find the sum of all terms of the Arithmetic Progression (A.P.).

Topic: Arithmetic progression

Previous-year question practice database

Answer

Solution diagram
Solution diagram
Exam answer

20th term; sum = 3,150.

Explanation

15n=300 ⇒ n=20. S₂₀=20/2(15+300)=3,150.

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