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U1=5-3.1=2
U2=5-3.2=-1
U3=5-3.3=-4
U4=5-3.4=-7
U5=5-3.5=-10
b.Un=2n+1
U1=2.1+1=3
U2=2.2+1=5
U3=2.3+1=7
U4=2.4+1=9
U5=2.5+1=11
c.Un=n²-1
U1=1²-1=0
U2=2²-1=3
U3=3²-1=8
U4=4²-1=15
U5=5²-1=24