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In the adjoining figure angleBAD = a, an...

In the adjoining figure `angleBAD = a, angleABC = b and angleBCD = c` and `angle ADC = d`, find the value of `angle ABC` in terms of a, c and d:

A

c - (a + d)

B

a - (c + d)

C

b - (c + d)

D

none of these

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A
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