Which set of angles can form a triangle
a. 1 acute and 2 right
b. 1 acute and 2 obtuse
c. 1 acute, 1 right, and 1 obtuse
d. 2 acute and 1 right

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio