Question

Tolong ya ...
2+3+4+5+6+..........+151 = ?

Answer 1

A = 2
b = 1
n = 150
maka hasilnya
Sn = n/2 ( 2a + ( n-1) b)
     = 15/2 ( 2x 2 + ( 150-1) 1)
     = 75 ( 4 + ( 149 ) 1)
     = 75 ( 153)
     = 11475