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B
102
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C
-42
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D
-54
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Solution
If the given numbers are of different signs then subtract the numbers and place the sign of greater number.
So,
-10 + 6 = -4 ,
-78 +24 = -54,
24 + (-66) = 24 - 66 = -42,
102 - (-23) - 23 = 102 + 23 - 23 = 102.