If a,b,c are in A.P., then \[{{2}^{ax+1}},{{2}^{bx+1}},\,{{2}^{cx+1}},x\ne 0\] are in [DCE 2000; Pb. CET 2000]

If a,b,c are in A.P., then \[{{2}^{ax+1}},{{2}^{bx+1}},\,{{2}^{cx+1}},

1.	If a,b,c are in A.P., then \[{{2}^{ax+1}},{{2}^{bx+1}},\,{{2}^{cx+1}},x\ne 0\] are in [DCE 2000; Pb. CET 2000]
A.	A.P.
B.	G.P. only when \[x>\text{0}\]
C.	G.P. if \[x<0\]
D.	G.P. for all \[x\ne 0\]
Answer» E.

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If a,b,c are in A.P., then \[{{2}^{ax+1}},{{2}^{bx+1}},\,{{2}^{cx+1}},x\ne 0\] are in [DCE 2000; Pb. CET 2000]

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