tentukan jumlah dari 1/2 (2)^1-1 dimana i=1 sampai dengan 5

jawab

5
Σ  1/2 (2^i) - 1
i  = 1

i = 1 , u1 = 1/2 (2¹) - 1 = 1/2 (2) - 1 = 0
i = 2 , u2 = 1/2 (2²) - 1 = 1/2(4) - 1 = 1
i = 3 , u3 = 1/2 (2³)  - 1 = 1/2(8) - 1 = 3
i = 4 , u4 = 1/2 (2⁴) - 1 = 1/2 (16) - 1 = 7
i = 5 , u5 = 1/2 (2⁵) - 1 = 1/2 (32) - 1 = 15
jumlah  = 0 + 1 + 3 + 7 + 15 = 26