Find the sum of all the positive integers less than 999 that are divisible by 15.​

Jawaban:

33165

Penjelasan dengan langkah-langkah:

999:15=66,6 so the latest number 66×15=990

15, 30, … , 990

n=66 U1=15 Un= 990

Sn=n/2 x (U1+Un)

S66= 66/2 x (15+990)= 33x 1005=33165