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Byju's Answer
Standard VII
Mathematics
Collection and Organisation of Data
21. If sn den...
Question
21. If sn denoted the sum of first n term of an A.P prove than s30 =3 (s20 - s10)
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Similar questions
Q.
If
S
n
denotes the sum of
n
terms of an
A
P
, prove that
S
30
=
3
(
S
20
−
S
10
)
Q.
If
S
n
denotes the sum of the first terms of an
A
P
, prove that
S
30
=
3
(
S
20
−
S
10
)
Q.
Let
S
n
denote the sum of first
n
-terms of an arithmetic progression. If
S
10
=
530
,
S
5
=
140
,
then
S
20
−
S
6
is equal to:
Q.
if
S
n
denotes the sum to
n
terms of a
G
.
P
show that
(
S
10
−
S
20
)
2
=
S
10
(
S
30
−
S
20
)
Q.
If
S
n
denotes the sum to
n
terms of a
G
.
P
. show that
(
S
10
−
S
20
)
2
=
S
10
(
S
30
−
S
20
)
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