已知等差数列{an}满足a2=3,Sn-Sn-3=51(n>3) , Sn= 100,则n的值为( )
A. You're welcome.
B. What shape would you like?
C. I'd like some cherries, too.
D. What kind of pudding would you like?
E. Yes. I want to buy a pudding.
A: Can I help you?
B:____
A:____
B: I'd like a chocolate pudding.
B: I'd like a heart-shaped pudding.
A: Anything else?
B:____How much are they?
A: 70 yuan.
B: Here is the money.
A: Thank you.
Who sings best? -
在△ABC中,点D在边BC上,且DC=2BD,AB:AD:AC=3:k:1,则实数k的取值范围为____