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Arithmetic Progressions

Question 1:

Which term of the A.P. 121, 117, 113 … is its first negative term?

[Hint: Find n for an < 0]

Answer:

Given A.P. is 121, 117, 113 …

a = 121

d = 117 − 121 = −4

an = a + (n − 1) d

= 121 + ...

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