Question

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

Tolong beritahu jawabannya

Answer 1

A = 1
b = 3 - 1 = 2
Un = a + (n - 1)b
99 = 1 + (n-1)2
99 - 1 = (n-1)2
98/2 = n-1
49 + 1 = n
50 = n

Sn = n/2(a + Un)
S50 = 50/2 (1 + 99)
= 25(100)
= 2.500

♣semogamembantu