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

1.	Which term of the A.P. 121,117,113....is its first negative term
Answer» A.P : 121, 117, 113...a = 121d = 117- 121=\xa0-4\xa0Let an= 0an\xa0= a + (n-1)d⇒\xa00 = 121 + (n-1)(-4)⇒\xa00 = 121 - 4n + 4⇒4n = 125⇒\xa0n = 125/4⇒\xa0n = 31.25\xa0n must be natural number therefore n= 32\xa0Hence,\xa032nd\xa0term is first negative number.

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