a2=13;a4=3 find a1,a3
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a2= 13 ,a4= 3
a+d = 13. ,a+3d =3
a+d -(a+3d) = 13-3
a+d -a-3d= 10
-2d=10
d=-5
a+d =13
a-5 = 13
a= 18
a3 =a+2d
= 18 +2×-5
= 8
a=a1= 18
a
a+d = 13. ,a+3d =3
a+d -(a+3d) = 13-3
a+d -a-3d= 10
-2d=10
d=-5
a+d =13
a-5 = 13
a= 18
a3 =a+2d
= 18 +2×-5
= 8
a=a1= 18
a
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