Hasil dr1+3+5+7+9..+99

• 1,3,5,7…99
a = 1
b = 3-1 = 2

Un = a + (n-1)b
99 = 1 + (n-1)2
99 = 1 + 2n -2
99 = 2n -1
99+1 = 2n ←→ 2n = 100
n = 100/2
n = 50

Sn = (n/2)(a + Un)
S50 = (50/2)(1+99)
S50 = 25(100)
S50 = 2500