a1=5,a4=91/2 find a2 a3
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a1 =5
a4 = 91/2
now,
a4 =a1+3d
91/2= 5+3d
=> 91= 10+6d
=>81=6d
=>d=81/6 =>27/2
so,
a2 =a+d
a2=5+27/2
a2=10+27/2
then ,
similarly,
a3=a2+d
a3=37/2+27/2
a4=64/2 =>32/1
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