looking to clarify my answers for some perm/combo questions?

Question

how many bit strings of length 10 have:
A)exactly 3 zeroes
B)more 0's than ones
C)at least seven ones
D)at least three ones:
i got:
A)120 B)386 C)176 D) 968

how many permutations of the letter ABCDEFGH contatin

A)the string ED
B)the sting CDE
C)string BA and FGH
D)strings AD, DE, and GH
E)strings CAB and BED
F)strings BCA and ABF

i got:
A) 7!
B) 6!
C) 5!
D) 5!
E) 4!
F) none, B cant be followed by C and F at the same time

Answer 1

I got the same for your first 4 answers; looking at second one

I can see how you got all of #2 also so I agree with your answers. Nice problem!