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=30/2 (2.20 + (30-1)3)
=15 (40+87)
=15 (127)
=1.905 kursi
a = 2
Dit : Un ?
Jwb : Un = a+(n-1)b
U30 = 2+(30-1)3
= 2+ 29.3
= 2 + 87
= 89