math questions~help plz

1.Find the digit in the ten-thousandth place of the series:
1+(1/1!)+(1/2!)+(1/3 !)+(1/4!)+.....
A.1 B.2 C.5. D.7 E.8
Answer: B
Since after 1/8!, the term is too little and cannot effect the answer
Onlt consider
1+(1/1!)+(1/2!)+(1/3 !)+(1/4!)+(1/5!)+(1/6!)+(1/7 !)+(1/8!)+....
=2.71827877
So the digit in the ten-thousandth place of the series is 2
2.A box contains ping pong balls. There are red ones, white ones, and blue ones. A red one is worth 10 points, blue is worth 5 points and white is worth 1 point. The Probability of drawing out a red one is 15%, a blue one is 30%, and a white one is 55%. What is the mathematical expectation on any one draw?
ANSWER: NO
the mathematical expectation on any one draw
=10*15%+5*30%+1*55%
=1.5+1.5+0.55
=4.55
So all answers are wrong

同意樓上問題二的回答，ｍａｔｈｅｍａｔｉｃａｌ　ｅｘｐｅｃｔａｔｉｏｎ的確係用佢的計法，因為加埋的PROBABILITY=1，而且條問題係講draw　一次
除非呢題問題出錯ｌａ