117 + 9 = 117 + 10 - 1 = 127 - 1

Is the above expression is correct?

True

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False

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Solution

The correct option is A
True

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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