a, b, c, d.... are in AP. Given statements below:
1) a+x, b+x, c+x, d+x.... are in AP
2) ax, bx, cx, dx.... are in AP
3) a/x, b/x, c/x, d/x.... are in AP
4) a+ax, b+bx, c+cx, d+dx.... are in AP
5) ax3, bx3, cx3, dx3,..... are in AP
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