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If ∑ ∑ ∑ ∞ = ∞ = ∞ = = = = 0 n 0 n n n 0 n n , c z , b y , a x where a, b, c are in A.P. and |a| < 1, |b| < 1, |c| < 1, abc ≠ 0, then :

1. x, y, z are in A.P.
2. x, y, z are in G.P.
3. z 1 , y 1 , x 1 are in A.P.
4. ) c b a ( 1 z 1 y 1 x 1 + + − = + +

Correct answer: z 1 , y 1 , x 1 are in A.P.

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