Question

1.which term of the AP 45,41,37,33............ is the first negative term?

Answer 1

a=45 d=-4

nth term= 45+(n-1)x(-4)= 49-4n
now, for negative term 49-4n less than 0
⇒4n is greater than 49
n is greater than 49/4
hence least value of n is 13
13 th term is the first negtive term

Answer 2

a=45 d=-4

nth term= 45+(n-1)x(-4)= 49-4n

now, for negative term 49-4n less than 0

⇒4n is greater than 49

n is greater than 49/4

hence least value of n is 13

13 th term is the first negtive term