the sum of the first 11 terms of an ap whose first term is 10/3, 0. find the sum of next 25 term
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Step-by-step explanation:
T
3
=a+2d=8 ……….(1)
T
11
=a+10d=20 …………..(2)
Equation (2) - Equation (1)
⇒8d=12
d=
8
12
=
2
3
a=8−2d=8−2(
2
3
)
a=5
S
10
=
2
10
[2a+9d]
=5[10+
2
27
]
=
2
235
.
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