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Dear ARITRA,
n2-n-300<0 ----1
it is quadratic in n so n = (1+√1201)/2 and n = (1-√1201)/2
and √1201=34.7 we can find out by underroot method
so n becomes 17.5 and -16.9
so we can write eqution 1 as
(n-17.5)(n+16.9)<0 by solving inequations
drawing the number line and marking the points we get
+ -16.9 - 17.5 +
the value of n -16.9 < n < 17.5
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