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