Answer Posted / tpt

4001 = 1*2^11 + 1*2^10 + 1*2^9 + 1*2^8 + 1*2^7 + 0*2^6 +
1*2^5 + 0*2^4 + 0*2^3 + 0*2^2 + 0*2^1 + 1*2^0

binary:
1111 1010 0001

hex/binary
0 0
1 1
2 10
3 11
4 100
5 101
6 110
7 111
8 1000
9 1001
A 1010
B 1011
C 1100
D 1101
E 1110
F 1111

so the hexadecimal format would be:
FA1

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