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Dit : a. u-25,u-50,u-75,u-100,un...
b. Luas segitiga ke-n dengan Luas segitiga 1 = 6 cm²
Jwb.
a. a=1
b = u2-u1 = 3-1=2
u25=a+(n-1)b u50=a+(n-1)b u75=a+74b u100=149+50
u25=1+(25-1)2 u50=1+(50-1)2 u75=1+74.2 u100=199
u25=1+48 <=> 49 u50=1+98 <=> 99 u75=1+148 <=>149
Un=a+(n-1)b
Un=a+nb-b
Un=1+2n-2
b. Δ1=6 Δ2=6x3=18 Δn=6n