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Un = a+(n-1)b
U8 = a+7b = 25
U5 = a+4b = 16
_________ -
3b = 9
b = 3
a+12 = 16
a = 4
U22 = a+21b
=4+21.3
=67
Sn = n/2(a+Un)
S22 = 11(67+4)
= 781
Mohon maaf apabila ada kesalahan