What will come in place of the x in the following Number series? 25, 100, x, 1600, 6400  Choose one.
A) 6400	B) 5600	C) 5790	D) 8554	E) 8756
(6400)   25 x 4 = 100, 100 x 4 = 400, 400 x 4 = 1600, 1600 x 4 = 6400.
<result>A</result>
What will come in place of the x in the following Number series? 25, 100, x, 1600, 6400