1 plus half plus two thirds plus three quarters. Add n + 1 / N, what is the result?

1 plus half plus two thirds plus three quarters. Add n + 1 / N, what is the result?

=1 + 1-1 / 2 + 1-1 / 3 + 1-1 / 4. + 1-1 / (n + 1) = n + 1-1 / 2-1 / 3-1 / 4-1 / 5. - 1 / (n + 1) = n + n / (n + 1) - (1 / 2 + 1 / 3 + 1 / 4 + 1 / 5 + 1 / 6 +. + 1 / N) = (n's square + 2n) / (n + 1) - (1 / 2 + 1 / 3 + 1 / 4 + 1 / 5 + 1 / 6 +. + 1 / N) can only calculate this

Half, two-thirds, negative three-quarters, negative four fifths, five sixths, six sevens. What's the 99th number

99÷4=24…… three
The 99th is negative = 99 / 100 of negative

(minus one-half) times (two-thirds) times (minus three-quarters) times (minus four fifths)

(-1/2)*(-2/3)*(-4/5)*(-3/4)=1/2*2/3*3/4*4/5=1/5
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