If 4, x₁, x₂, x₃, 28 are in AP then find x₃ *
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a=4,n=5
So,
tn=a+(n-1)d
28=4+5-1×d
28=4+4d
28-4=4d
24=4d
d=6
hence,a+(n-1)d=tn
4+4-1×6=22
therefore , x3 =22
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