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a.
s(25) = 1+5+25 = 31
s(30) = 1+2+3+5+6+10+15+30 = 72
s(32) = 1+2+4+8+16+32 = 63
b.
s(14) =? s(15)
1+2+7+14 =? 1+3+5+15
24 = 24 (Terbukti)
c.
s(3) s(5) =? s(15)
(1+3)(1+5) =? 1+3+5+15
4 x 5 =? 24
20 =/= 24
Ternyata tidak sama