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Mathematics
Mathematics
Problem
Find the value of
4
∑
k
=
1
6
3
k
−
2
∑
k
=
1
6
k
\displaystyle 4\sum_{k=1}^{6} 3^{k}-2\sum_{k=1}^{6} k
4
k
=
1
∑
6
3
k
−
2
k
=
1
∑
6
k
. a) 4368 b) 4284 c) 4326 d) 4410
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