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Question
Mark against the correct answer in each of the following: What must be subtracted from $$-3$$ to get $$-9?$$
A
-6
B
6
C
12
D
-12
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Solution
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Correct option is C. 6 Let us assume closure property of subtraction [a-b=c] Let, $$a = -3,$$ missing integer $$b = x,$$ and $$c = 9$$, then $$\Rightarrow -3-(x) = -9$$ $$\Rightarrow -3+9 = x$$ $$\Rightarrow x = 6$$
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