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U8=22
S20=?
U5=13
a+4b=13
U8=22
a+7b=22
a+4b=13
a+7b=22
_________-
-3b=-9
b=3
a+4b=13
a+4(3)=13
a+12=13
a=1
U20=a+(n-1)b
=1+(19)3
=1+57
=58
a+4b=13
a+7b=22
------------- -
-3b = -9
b = 3
a+4(3)=13
a+12=13
a=13-12=1
U20 = 1 + 19 . 3
= 1 + 57
= 58