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If l n(a+c),l n(a-c)a n dl n(a-2b+c) a...

If `l n(a+c),l n(a-c)a n dl n(a-2b+c)` are in A.P., then (a) `a ,b ,c` are in A.P. (b) `a^2,b^2, c^2,` are in A.P. (c) `a ,b ,c` are in G.P. d. (d) `a ,b ,c` are in H.P.

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