10+15+20+...
U7=a+b×6
U7=10+5×6
U7=40
Sn=n(a+Un)/2
S7=7×(10+40)/2
S7=7×50/2
S7=7×25
S7=175
Jawab:
Penjelasan dengan langkah-langkah:
" Life is not a problem to be solved but a reality to be experienced! "
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10+15+20+...
U7=a+b×6
U7=10+5×6
U7=40
Sn=n(a+Un)/2
S7=7×(10+40)/2
S7=7×50/2
S7=7×25
S7=175
Jawab:
Penjelasan dengan langkah-langkah: