(A) Determine all possible non zero real P such that {P}, [P] and P are in arithmetic sequence.
(B) Determine all possible non zero real Q such that {Q}, [Q] and Q are in geometric sequence.
(C) Determine all possible non zero real R such that [R], {R} and R are in geometric sequence.
(D) Determine all possible non zero real S such that {S}, [S] and S are in harmonic sequence.
Note: [x] is defined as the greatest integer ≤ x and {x} = x - [x]
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