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We will be constructing strings from the alphabet W , x , Y , Z in this problem. Call such strings WXYZ strings. How many
We will be constructing strings from the alphabet in this
problem. Call such strings WXYZ strings. How many WXYZ strings
of length contain
a exactly Ws
b at most s
c exactly Ws and exactly Zs
d are palindromic ie read the same forward and backward, for
example XXWZZWXX
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