1if ab2b and abcdad3bcprove that abcd are in


1.If a+b=2b and ab+cd+ad=3bc,prove that a,b,c,d are in A.P
2.The nth term of an A.P is an+b.Find the sum of the series upto n terms.

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Mathematics: 1if ab2b and abcdad3bcprove that abcd are in
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