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Find the number of terms of the AP 121, 117, 113, , -3 ?

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Find the number of terms of the AP $121, 117, 113, \dots, - 3$ ?

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Find the number of terms of the AP

121, 117, 113, \dots, - 3

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Text solutionVerified

Given

121, 117, 113..., - 3

a = 121

d = 117 - 121 = - 4

a_{n} = - 3

a_{n} = a + (n - 1) d

- 3 = 121 + (n - 1) (- 4)

- 3 = 121 - 4 n + 4

4 n = 128

n = \frac{128}{4}

n = 32

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Question Text	Find the number of terms of the AP $121, 117, 113, \dots, - 3$ ?
Answer Type	Text solution:1
Upvotes	150