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U-5=31
RUMUS Un=A+(N-1)B
19=A+B
31=A+4B
DIELIMINASIKAN MENJADI
-12=-3B
B=4
19=A+B
19=A+4
-A=4-19
-A=-15
A=15
MK u-30= a+(n-1)b
15+(30-1)4
15+116
=131
a + 4b = 31
_________ -
3b = 12
b = 4
a = 15
U30 = a + 29b
= 4 + 29(15)
= 439