My question got deleted last time as the question wasn't correct.But this time it is correct.
Please help me with this problem asap.Nice points
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thank you so much! posting some more questions on range
@bella here some mistake in sign of inequality after " taking reciprocal"
answer is absolutely right but you should write -infinity<f =<-1/7 or 1=<f <infinity
the answer is correct after all.
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