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ICSE Question Bank
2023Q6(ii)(a)Arithmetic Progression
NumericalEasy1 mark
6(ii)

The 5th and 9th term of an Arithmetic Progression are 4 and -12 respectively. Find :

the first term

Topic: Arithmetic progression

Previous-year question practice database

Answer

Exam answer

First term a = 20.

Explanation

T₅=a+4d=4 and T₉=a+8d=−12. Subtracting gives 4d=−16 ⇒ d=−4; hence a=20.

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