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What is the value of
∑i=124i+2\sum_{i=1}^24^i+2∑i=124i+2 ?
24
14
13
∑i=133i\sum_{i=1}^33^i∑i=133i ?
120
140
130
∑i=167−i\sum_{i=1}^67-i∑i=167−i ?
21
Fill in the blank
∑i=1412i\sum_{i=1}^4\frac{1}{2i}∑i=142i1 ?
25/24
140/92
∑i=2510i\sum_{i=2}^5\frac{10}{i}∑i=25i10
77/6
140/9
∑i=152i\sum_{i=1}^52i∑i=152i ?
10
15
30
∑i=141−(−1)i\sum_{i=1}^41-\left(-1\right)^i∑i=141−(−1)i ?
9
4
2
∑i=13i2\sum_{i=1}^3i^2∑i=13i2 ?
∑i=143i−2i\sum_{i=1}^43^i-2^i∑i=143i−2i ?
90
∑i=131i2\sum_{i=1}^3\frac{1}{i^2}∑i=13i21
49/36
14/29
It is done.