Ahasil dari 1 + 2 + 3 + 4+ .... + 119 adalah .... Question from @Indhyna

September 2018 2 25 Report

Ahasil dari 1 + 2 + 3 + 4+ .... + 119 adalah ....

abrahamwong42 1 + 2 + 3 + 4 + 5 + ... + 119
$U_{n} = 119 \\ U_{1} = 1 \\ b = 1 \\ U_{n} = a + (n-1)b \\ 119 = 1 + (n-1)1 \\ 119 = 1 + n - 1 \\ 119 = n \\ S_{n} = \frac{n}{2} (2a + (n-1)b) \\ S_{n} = \frac{119}{2} (2 + (118)1) \\ S_{n} = \frac{119}{2} (120) \\ S_{n} = \frac{119 * 120}{2} \\ S_{n} = 7140$

Jadi , 1 + 2 + 3 + 4 + 5 + ... + 119 = 7140
:)

1 votes Thanks 1

amaki8hino 1+2+3+= 10
10 + 119= 129

0 votes Thanks 0

About Us

Life Enjoy

" Life is not a problem to be solved but a reality to be experienced! "

2 pangkat -3 x 2 pangkat -4 = a. -128 b. -1 per 128 c. 1 per 128 d. 1 per 4.096

2 pangkat negatif 3 - 2 pangkat negatif 4 =

Pada sidang BPUPKI terjadi pertentangan antar golongan islam dan sekutu sebab...

Recommend Questions

Life Enjoy

Get in touch

Social