if two integers x , y ( x > y ) are selected from - 10 to 4 ( inclusive ) , how many possible cases are there ?
"if two integers x , y ( x > y ) are selected from - 10 to 9 ( inclusive ) , how many possible cases are there ? a . 150 b . 180 c . 190 d . 210 e . 240 - - > 15 c 2 = 15 * 14 / 2 = 105 . therefore , the answer is e ."
add(add(add(add(add(add(add(4, 10), add(4, const_2)), add(4, const_1)), 4), 10), const_2), const_1)