the operation is defined for all integers a and b by the equation ab = ( a - 1 ) ( b - 1 ). if x 20 = 190, what is the value of x?  Choose the correct choice:
A) 10  B) 12  C) 11  D) 13  E) 14
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">190 / 19</gadget>
<output>10</output>

<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<result>C</result>
the operation is defined for all integers a and b by the equation ab = ( a - 1 ) ( b - 1 ). if x 20 = 190, what is the value of x?
add(divide(190, subtract(20, 1)), 1)
"ab = ( a - 1 ) ( b - 1 ) x 20 = ( x - 1 ) ( 20 - 1 ) = 190 - - > x - 1 = 10 - - > x = 11 answer : c"