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Verified answer
Jawabbilangan habis dibagi 4
a = 4, un = 96
n = 96/4 = 24
jumlah = n/2 ( a + un) = 24/2 (4 +96) = 1.200
bilangan habis dibagi 20
a= 20 . un= 80
n= 4
jumlah = n/2 (a + un) = 4/2(20+80) = 200
jumlah habis dibagi 4 tetapi tidak habis dibagi 20 = 1.200 - 200 = 1000