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CBSE Class 10 Answered

Which term of the AP :121,117,113,...., Is its first negative term ?
Asked by pashasameer130 | 25 Jun, 2019, 10:04: PM
answered-by-expert Expert Answer
121,117,113,...., 
Here, a = 121, d = 117 - 121 = -4
According to the question,
an = 0
a + (n - 1)d = 0
121 + (n - 1)(-4) = 0
121 - 4(n - 1) = 0
4(n - 1) = 121
n - 1 = 30.25
n = 31.25
Hence, 31st term of the given AP is negative.
Answered by Sneha shidid | 26 Jun, 2019, 09:14: AM

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