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Question 1. Find: (iv) 10th term of the AP -40, -15, 10, 35, ………….

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This is the basic and conceptual question from Chapter name- Arithmetic Progression
Chapter number- 9
Exercise 9.4

In this question we have been given an arithmetic progression. And we have to find its 10th term.

CBSE DHANPAT RAI publications
Class:- 10th
Understanding CBSE Mathematics
Question 1(iv)

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1 Answer

  1. Given that,

    A. P. is – 40, -15, 10, 35, ……….

    First term (a) = -40,

    Common difference (d) = Second term – fast term

    d = -15 – (- 40) = 40 – 15 = 25

    As we know that, to find nth term in an A.P = a + (n – 1)d

    Therefore, 10th term of A. P. = -40 + (10 – 1)25

    = – 40 + 9.25 = – 40 + 225 = 185

    Hence 10th term of the A.P is 185

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