Question

Find the no of terms in ap 110 121 132 ..........990

Answer 1

Answer:

81

Step-by-step explanation:

n=a+(n-1)d

990=110+(n-1)11

990-110=(n-1)11

880/11=n-1

80=n-1

80+1=n

81=n

Answer 2

Answer:

a= 110 d= 121-110= 11 , an = 990

an= a+ (n-1)d=

990= 110+ (n-1)11

990= 110+11n-11

990-99=11n

891=11n

n= 891/11

n=81