Find a, b and c such that the following numbers are in AP: a, 7, b, 23, c.
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if they are in ap then a=7,a+d=b=23
so d=6.......if d=16 then a+2d=c=7+2(16)=39=c
so d=6.......if d=16 then a+2d=c=7+2(16)=39=c
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Plz refer to this attachment
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