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The decimal value 0.25

1. is equivalent to the binary value 0.1
2. is equivalent to the binary value 0.01
3. is equivalent to the binary value 0.00111...
4. cannot be represented precisely in binary

1st Multiplication Iteration
Multiply 0.25 by 2

0.25 x 2 = 0.50(Product)         Fractional part=0.50            Carry=0    (MSB)

2nd Multiplication Iteration

Multiply 0.50 by 2

0.50 x 2 = 1.00(Product)         Fractional part = 1.00            Carry = 1(LSB)

The fractional part in the 2nd iteration becomes zero and hence we stop the multiplication iteration.

Carry from the 1st multiplication iteration becomes MSB and  carry from 2nd iteration becomes LSB

So the Result is 0.01

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ans b) (2-2)