Question

tentukan notasi sigma 7+11+15+...+63

Answer 1

A = 7
b = 11-7 = 4
Un = 7-4 + 4n
Un = 4n + 3
63 = 4n + 3
4n = 60
n = 60/4
n = 15
Sn = n/2 x (7 + 4n + 3) = n(4n + 10)/2
Sn = 2n² + 5n

Z, n = 1 - 15 [ 2n² + 5n ]

Ket.
Z = notasi sigma batas bawah 1 batas atas 15