Question
117 + 9 = 117 + 10 - 1 = 127 - 1 Is the above expression is correct?
Answer: Option A
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Yes it is correct. 9 can be written as 10 - 1 So 117 + 9 = 117 + 10 - 1 Again (117+ 10) = 127, so (117+ 10) - 1= 127 - 1
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