51.
If are in A.P. prove that a, b, c are in A.P.
are in A.P.
or
are in A.P.
or
are in A.P. (By adding 1 to each other)
or
are in A.P.
or
are in A.P. (By dividing each number by ab + bc + ca)
or
are in A.P. (By multiplying each number by abc)
or a, b, c are in A.P.
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