Question

suma lui gaus:3+6+9+.......+300 Ajutor!!!!!!!

Answer 1

3 +6 + 9 + .........+300
n = ( 300 - 3 ) : ( 6 - 3 ) +1 =
n = 297 : 3 +1 =
n = 99 +1
n = 100

S = [( 300 +3) x 100 ]: 2
S = (  303 x 100 ) : 2
S = 30300 : 2
S = 15150.