5555555555
142. Add the following BCD numbers. 0110   0111   1001 0101   1000   1000
(a) 0000 1011 0000 1111 0001 0001
(b) 0001 0001 0001 0101 0001 0001
(c) 0000 1011 0000 1111 0001 0111
(d) 0001 0001 0001 0101 0001 0111
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