$$x = \sum\limits_{n = 0}^\infty {{a^n},y = \sum\limits_{n = 0}^\infty {{b^n},z = \sum\limits_{n = 0}^\infty {{c^n}} } } $$, where a, b, c are in A.P. and |a| < 1, |b| < 1, |c| < 1, abc $$\ne$$ 0, then :
- Ax, y, z are in A.P.
- Bx, y, z are in G.P.
- C$${1 \over x}$$, $${1 \over y}$$, $${1 \over z}$$ are in A.P.
- D$${1 \over x}$$ + $${1 \over y}$$ + $${1 \over z}$$ = 1 $$-$$ (a + b + c)
✓ Correct answer: C
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