Question

Hasil dari 1 + 2 + 3 + 4 + 5 ..... + 2019 adalah​

Answer 1

Diketahui :
a = 1
= 2
= 3
= 2019

Ditanya :
?

Jawab :
b = - = - a
b = 3 - 2 = 2 - 1
b = 1

= a + (n - 1)b
2019 = 1 + (n - 1)1
2019 = 1 + n - 1
n = 2019

= (a + )
= (1 + 2019)
= 1.009,5(2020)
= 2.039.190