1+2+3+4+...+77+78+79+80
Matematika
intanwidyadewi
Pertanyaan
1+2+3+4+...+77+78+79+80
1 Jawaban
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1. Jawaban Jesslynjie
angka terakhir = 80
80=n
(n+1).n/2
(80+1).80/2
81.80/2
6480/2
3240