Answers

2014-11-13T21:51:30+05:30
(-10-10)÷(-10-(-10-10))

==>(-20) ÷ (-10 - (-20 )
==>-20 ÷ (-10 + 20)
==>-20 ÷ 10
====>> -2 is the answer

Hence option 4 is correct .
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