【How-to】How many combinations with 8 numbers

=1. Total of these combinations = 8+28+56+70+56+28+8+1 = 254. Total of these distinct permutations = 8+56+336+1,680+6,720+20,160+40,320 +40,320 =109,608. Respective permutations, including those non-distinct with repeating digits, are: 8+(8^2)+(8^3)+(8^4)+(8^5)+(8^6)+(8^7)+(8^8) = 19,173,960.