diketahui rumus suku ke-n suatu deret adalah un=6n-11.nilai U15-U12=adalah...

U15= 6.15-11 =90-11 = 79
U12= 6.12-11=72-11= 61

u15-u12 = 79-61= 18

semoga benar

un=6n-11
=> un=6n-11
u15=6(15)-11
=90-11
=79
=> un=6n-11
u12=6(12)-11
=72-11
=61
# U15-U12=79-61
=18