the sum of the even numbers between 1 and n is 95 * 96 , where n is an odd number , then n = ?
"let n - 1 = 2 a . 2 + 4 + . . . + 2 a = 2 * ( 1 + 2 + . . . + a ) = 2 * ( a ) ( a + 1 ) / 2 = ( a ) ( a + 1 ) = 95 * 96 then a = 95 and n = 191 . the answer is d ."
add(multiply(95, const_2), 1)