13.Which geometric series has a sum of 1/3?
A. ⅓ + ⅓ + ⅓ + ...
B. 3/10 + 3/100 + 3/1000 + ...
C. 1/10 + 1/100 + 1/1000 + ...
D. 3 + 1 + 1/3 + 1/9 + ...
14.What is the next term in fhe harmonic sequence: 1/5 , -½ , ½?
A. ⅓
B. ¼
C. 1/5
D. 1/6
15.What is the next term in the Fibonacci sequence 1 , 1 ,2,3,5,8,13,21,34,55,89?
A. 123
B. 124
C. 134
D. 144​