qqp question1: If [math]5 - 4 = 23[/math], [math]8 - 1 = 63[/math], [math]6 -16 = 32[/math], [math]9 - 9 = 78[/math] and [math]3 - 9 = 6[/math], then what is the value of [math]3 - 81[/math]? question2: How many 6 digit palindrome numbers can be formed?