u1=3,u2=7,u3=11
a=3
b=4
un =a+(n-1)b
u25 =3+(25-1)4
=3+24×4
=99
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u1=3,u2=7,u3=11
a=3
b=4
un =a+(n-1)b
u25 =3+(25-1)4
=3+24×4
=99