4.2x4.2-1.9x1.9/2.3x6.1 is equal to:	Select the correct option: A) 2 B) 1 C) 3 D) 4 E) 8
Given Expression   =(a2 - b2)/(a + b)(a - b)   =(a2 - b2)/(a2 - b2)   = 1.   Answer is 1.
<result>B</result>
4.2x4.2-1.9x1.9/2.3x6.1 is equal to: