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38=a+b*4. suku 10 = 6+72
38=6+b*4. suku 10 = 78
32=b*4.
8=b
U5= 38
dit: U10
subs.
U5=> a+4b= 38
6+4b=38
4b=38-6
4b=32
b=32/4=8
U10= a+(n-1)b
=6+(10-1)8
=6+9×8
=6+72
=78