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Un=4n-5
U2=42-5
=8(4x2)-5
=3
U3=43-5
=12-5
=7
b=U3-U2=7-3=4
= 4 -5
= -1
U2 = 4(2) - 5
= 8 -5
= 3
U3 = 4(3) -5
= 12 -5
= 7
b = U2 - U1
= 3 -(-1)
= 4