2的2007次方的個位數

2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16
.......
佢既個位數係跟一個formula
2^(4n+1) 既個位數係 2
2^(4n+2) 既個位數係 4
2^(4n+3) 既個位數係 8
2^(4n+4) 既個位數係 6

2007 = 4 x 501+ 3 = 4n+3
個位係8

2007+2007+2007=1

8

2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 6 (16)

2^5 = 2 (32)
2^6 = 4 (64)
2^6 = 8 (128)
2^6 = 6 (256)

...

2^2005 = 2
2^2006 = 4
2^2007 = 8

2的2007次方的個位數是8!!