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U1 = 15 - 4 (1 3/7) = 15 - 5 5/7
= 9 2/7
U25 = a + (n – 1)b
= 9 2/7 + (25-1)1 3/7
= 9 2/7 + 240/7
= 305/7 = 43,57
=a+4b=15
U12=a+(12-1)b=25
=a+11b=25
eliminasi a+4b=15
a+11b=25 -
7b=10
b=
dimasukan a+4b=15
a+4(=15
a=
a=9
suku pertama =9
suku ke 25=9+(25-1)
=9+
=43