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Mathematics
Mathematics
Problem
Which of the following is the expanded form of
∑
r
=
1
5
4
⋅
2
r
−
1
\displaystyle\sum_{r=1}^{5} 4\cdot 2^{\,r-1}
r
=
1
∑
5
4
⋅
2
r
−
1
? a)
8
+
16
+
32
+
64
+
128
8 + 16 + 32 + 64 + 128
8
+
16
+
32
+
64
+
128
b)
4
+
8
+
16
+
32
4 + 8 + 16 + 32
4
+
8
+
16
+
32
c)
4
+
8
+
16
+
32
+
64
4 + 8 + 16 + 32 + 64
4
+
8
+
16
+
32
+
64
d)
4
+
8
+
16
+
32
+
64
+
128
4 + 8 + 16 + 32 + 64 + 128
4
+
8
+
16
+
32
+
64
+
128
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