Q. 2 E4.3( 27 Votes )

Which term of the A.P. is its first negative term?

Answer :

a = 121, d = -4

An = -ve


An= a + (n – 1) d


= 121 + (n – 1) -4


= 125 – 4n


Since, we want –ve term


Therefore, 4n should be a number greater than 125


Hence, 128 is the number greater than 125 and divisible by 4


4n = 128


n = 32


Therefore, 32nd term of the given A.P. is –ve


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