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habis : 3 = 15, 18,...99
a = 15
b= 3
un = a + (n - 1)b
n = (un - a) /b) + 1
n = (99 - 15)/3 + 1
n =28 + 1 = 29
S29 = 29/2( a + u29) = 14,5 (15 + 99)
= 14,5 (114)
= 1.653
Habis bagi 5= 15,20,25...95
a=15 b = 5
n =(95 - 15 )/5) + 1
n = 17
S17= 17/2 ( 15 + 95)
= 8,5 (110)
= 935
Shabis bagi3 - Shabis bagi 5 =
1.653-935 = 718
a=15
b=1
pembahasan
un=a+(n-1)b
n=un-a/b
n=99-15/1
n=84/1
n=84
kalau salah maaf