1.

If a, b, c, d are in H.P., then ab + bc + cd is equal to(1) 3ad(2) (a + b)(c + d)(3) 3ac(4) 0

Answer» If a, b, c, d are in H.P., then ab + bc + cd is equal to
(1) 3ad
(2) (a + b)(c + d)
(3) 3ac
(4) 0


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