Answer:
Step-by-step explanation:
The sum you are trying to understand is this.
Remember that in general when you have a geometric series
you have that
and that equality is true as long as .
Therefore here we have
and
Therefore we can use the formula and
i cant make a diagram but here i go.
250-135=115
250-150=100
100+115=215
250-215=35
So your answer is that 45 people like both, 115like modern, 100 like folk song, and 35 like both.
I thik the option C should be used.
A
the answer is a because it has no decimal
it is in square root