please solve one by one.
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Q. (1)
ans:- a+b-c = 3
वर्ग करने पर
(a+b-c)²=9
a²+b²+c²+2ab-2bc-2ac = 9
चूँकि a²+b²+c²=77
अत: 77+2(ab-bc-ac) = 9
2(ab-bc-ac) = -68
ab-bc-ac = -34
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