Question

Find the sum of the terms of the AP 1,5,9…..,101​

Answer 1

Answer:

n = 26     Sn = 1326

Step-by-step explanation:

a = 1   d = 4

l(an) = 101

l = a + (n-1) d

101 = 1 + (n-1) 4

100 = (n-1) 4

100/4 = n-1

25 = n-1

n = 26

Sn = n/2 ( a + l)

Sn = 26/2 ( 1 + 101 )

Sn = 13 ( 102 )

Sn = 1326

Thank You =)