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a. un=2n + 1
u1= 2x1 +1= 3
u2=2x2 +1= 4+1=5
u3=2x3+1= 7
u4=2x4+1=9
u5 =2x5+1=11
5sukunya=1,3,5,7,9
b.un = n +5...cara sama 5sukunya
6,7,8,9,10
c.un=4n +3 ...5 sukunya 7,11,15,19,23
d.un=1/2n+2..5sukunya 2,5, 3, 3,5 , 4, 4,5