Question

2+4+6+8+ 10......+50 beserta caranya

Answer 1

Sn = n/2 (2a+(n-1)b)
= 25/2 (2x2+(25-1)2)
=25/2 (4+24x2)
=25/2 x 52
= 650.
Ket: n = banyak suku
a = suku pertama
b = beda