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Question

In the given figure, CAB=80o,ABC=40o. The sum of DAB + ABD is equal to
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A
80o
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B
100o
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C
120o
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D
140o
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Solution

The correct option is B 120o
In the given figure,
ACB=ADB=600 (Angle in same segment)

Therefore,
ADB=600

We know that the sum of all angles of the triangle is 1800.
ADB+DAB+ABD=1800
DAB+ABD=1800ADB
DAB+ABD=1800600=1200

Hence, this is the answer.

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