What is the average of the numbers $$a_1, a_2, ....... a_{10}$$?
I. $$a_1 + a_2 + ..... + a_9 = 810$$
II. $$a_2 + a_3 + ..... + a_{10} = 900$$

A

If the statement I alone is sufficient to answer the question

B

If the statement II alone is sufficient to answer the question

C

If both the statements I and II are sufficient to answer the question but neither statement alone is sufficient.

D

If both the statements I and II together are not sufficient to answer the question and additional data is required.