Un = a x r^(n - 1)
U1 = a x r^(1 - 1)
U1 = a
1 = a
a = 1
U2 = 1 x r^(2 - 1)
U2 = r
2 = r
r = 2
U4 = 1 x 2^(4 - 1)
U4 = 1 x 2^3
U4 = 8
8 = 8
U20 = 1 x 2^(20 - 1)
U20 = 1 x 2^19
U20 = 524288.
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Verified answer
Un = a x r^(n - 1)
U1 = a x r^(1 - 1)
U1 = a
1 = a
a = 1
U2 = 1 x r^(2 - 1)
U2 = r
2 = r
r = 2
U4 = 1 x 2^(4 - 1)
U4 = 1 x 2^3
U4 = 8
8 = 8
U20 = 1 x 2^(20 - 1)
U20 = 1 x 2^19
U20 = 524288.