tell me full explation and no shortcuts please and answer is
4) answer is -5/11
5) answer is -9/10
6) answer is 1/3
7) answer is 4/35
Please tell me full explation and no shortcuts
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6 th answer is wrong not 1/3 it is 3
7 th answer also may be wrong not 4/35
it is -1/49
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