In class of 30 students 14 are boys. If 2 boys drop out of the class and 2 girls are added what fraction of the class will be bo
2 answers:
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The first four terms of the series probably refer to the first four partial sums.
which you can compute either by adding one term at a time, or using the well-known formula,
(I can provide a link to a derivation I gave in a nearly identical question in the comments)
The series converges as
if and only if 
, which is certainly the case here, since 
.
Extrapolating from the formula above, the sum of the convergent series is
so the sum for this series is
.
which you can compute either by adding one term at a time, or using the well-known formula,
(I can provide a link to a derivation I gave in a nearly identical question in the comments)
The series converges as
Extrapolating from the formula above, the sum of the convergent series is
so the sum for this series is