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The number of Clock pulses needed to change the contents of an 8-bit-up-counter from (10101011) to (00111010) is ______________
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$171 \rightarrow 255 \rightarrow 58  = 84+59 = 143$
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$10101011= 171$ 

$00111010 = 58$

$8$-bit up counter means it is mod$256$ counter, we are at $171$ clock pulse , clock pulses we need to reach initial state is $256-171=85$ clock pulses , we need $58$ more clock pulses to reach $00111010$ 

$85+58 = 143$

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