Question

(x+y)(a+b)+(x-y)(a+b)
then ams goes like this☝️
but where is another (a+b ) gone??
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Answer 1

Answer:

The sequence 0.xyxyxyxy... can be written as:

(xy÷100)+(xy÷10000)+(xy÷1000000)+...

=(xy÷100)×(1+1÷100+1÷10000+....) [The second part is a geometric series with ratio 1/100]

=(xy÷100)×1÷(1−1÷100)

=xy÷99

as xy÷ab=0.xyxyxyxy...=xy÷99

ab is 99

Step-by-step explanation:

hope this will help you