Question

1+3+5+7+9+...+99

Please jawabannya apaaaa?

Answer 1

Konsep Aritmetika :

Awal = 1
Beda = 2

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

Sn = n/2 (a + Un)
= 50/2 (1 + 99)
= 25 (100)
= 2.500