CBSE 2006 C7 The 6th term of an Arithmetic Progression is zero. Prove – InterviewSolution

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CBSE 2006 C7 The 6th term of an Arithmetic Progression is zero. Prove that its 21st term is triple of its 11th term.

Answer»

6th term of AP is a+5d=0a=-5d

21st term=a+20d=-5d+20d=15d11th term=a+10d=-5d+10d=5d

3(5d)=15d3(11th term )=21st term

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