a, b, c, d,\[\in {{R}^{+}}\] such that a, b, and c are in A.P. and b, c and , d are in H.P., then

a, b, c, d,\[\in {{R}^{+}}\] such that a, b, and c are in A.P. and b,

1.	a, b, c, d,\[\in {{R}^{+}}\] such that a, b, and c are in A.P. and b, c and , d are in H.P., then
A.	ab = cd
B.	ac = bd
C.	bc = ad
D.	None of these
Answer» D. None of these

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a, b, c, d,\[\in {{R}^{+}}\] such that a, b, and c are in A.P. and b, c and , d are in H.P., then

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