1 2/3 + 1 2/3+ 2 1/5+2 1/5
Answers
Answered by
2
Answer:
4+4+21/5+21/5
8+42/5
40+42
/5
82/5
16.4
answer 16.4
Answered by
0
Answer:
Step-by-step explanation:
T
n
=
(2n+1)
(3+(n−1)×3)(1
2
+2
2
+...+n
2
)
T
n
=
2n+1
3n.
6
n(n+1)(2n+1)
=
2
n
2
(n+1)
S
15
=
2
1
n=1
∑
15
(n
3
+n
2
)=
2
1
[(
2
15(15+1)
)
2
+
6
15×16×31 ]
=7820
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