Sequences and Series · Class 11 · CBSE · Science Mathematics

The 20th term of the arithmetic progression 5, 9, 13, 17, ... is:

Practice question from Sequences and Series (Class 11 · CBSE · Science Mathematics), with the correct answer and a step-by-step solution.

easy · MCQ · Q-657B45

The 20th term of the arithmetic progression 5, 9, 13, 17, ... is:

  1. A.77
  2. B.81Correct answer
  3. C.85
  4. D.89

Solution

Here, a=5a=5, d=4d=4, and n=20n=20. Thus, a20=a+(n−1)d=5+19(4)=81a_{20}=a+(n-1)d=5+19(4)=81.

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