Question

Hlo mate anyone solve my question please. Fast its urgently

Which term of AP:121,117,113,......., is its first negative term?

Answer 1

 a=121, d=-4, let an=0

an=a+(n-1)d

0=121+(n-1)(-4)

-121=-4n+4

-125=-4n

n=31.25

since n has to be a whole no., therefore, the ans is 32 ( the no. next to 31.25)

hence the 32nd term is the first negative term

Answer 2

Answer:

32nd term

Step-by-step explanation:

AP is 121,117,113...

First term a = 121

Common difference = 117 - 121

                                  = -4.

Let the nth term of the AP is the first negative term.

an < 0.

a + (n - 1) * d < 0

121 + (n - 1) * (-4) < 0

121 - 4n + 4 < 0

125 - 4n < 0

125 < 4n

4n > 125

n > 125/4

n > 31.25

Since, the term cannot be in decimal.So, n = 32.

Hence, the first negative term is 32nd term.

Hope it helps you

#Bebrainly