A binary number should start with 1. So 00000111 is really just 111, which equals 7
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00000111 + 00001110 = 00010101
The decimal number for 00000111 is 7. In binary form, each digit represents a power of 2, starting from the right with 2^0. So, from right to left, the binary digits 111 correspond to 2^0 + 2^1 + 2^2, which equals 7 in decimal form.
The decimal number 23 corresponds to the binary number 10111.
a) 6401 in Binary is 1100100000001b) 1010110 in decimal is 86
That's not a binary number ! Binary numbers can only use the digits 1 and 0.