(Q14).Find the sum of the following APs:
(iii) 0.6, 1.7, 2.8,…, to 100 terms.
Given A.P : 0.6, 1.7, 2.8,…. S100
a =
; d = a
2
– a
1
=
–
=
; n =
S
n
=
n
2
[2a + (n-1)d]
∴ S
100
=
2
[2 ×
+ (
-1)
]
=
[
+
×
]
=
[
+
]
=
×
=
Clear