Question

The number of terms in AP sequence 20, 25, 30,
..., 100 is
(a) 16
(b) 17 (c) 15 (d) 14​

Answer 1

Answer:

17

Step-by-step explanation:

a= 20

d=25-30=5

an=100

a+(n-1)=100

=≥. 20+(n-1)5=100

=≥ n-1= (100-20)/5

=≥. n-1=16

=≥ n= 17

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Answer 2

Hello

a = 20 , d = 25 - 20 = 5 ( a2 - a1)

By using formula => an = a+(n - 1) d

100= 20(n - 1)d

(n - 1) (5) 100 - 20

(n - 1)= 80/5 = 16

n= 16 + 1

n = 17

Hence Option B is correct..

Hope it will help you ✌️