How many terms of series 3+5+7 amount upto 960 ~
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Answered by
0
Step-by-step explanation:
Explanation:
For an arithmetic sequence with initial value
a
and a difference between terms of
d
the sum of the first
n
terms is given by the formula
Σ
=
n
2
⋅
(
2
a
+
(
n
−
1
)
d
)
For the given sequence
a
=
1
and
d
=
2
We are told that the required sum is
961
So
961
=
n
2
⋅
(
2
(
1
)
+
(
n
−
1
)
(
2
)
)
961
=
n
2
⋅
2
+
n
2
(
n
−
1
)
(
2
)
961
=
n
+
n
2
−
n
n
2
=
961
n
=
31
Answered by
0
how many terms of the series 3 + 5 + 7 plus amount to to 960
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