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a= 64
r = 32/64 = 1/2
Un = a.
= 64 .
=
=
=
= (B)
2.
a + (a+2)+ (a + 4) = 51
3a + 6 = 51
3a = 51 - 6
3a = 45
a = 15
deret nya 15, 17, 19
hasil kali bilangan besar dan kecil = 19 x 15 = 285(B)