InterviewSolution
`.^(2N)C_(N) XX .^(n)P_(n)``(1/2)^(n) .^(2n) C_(n) xx .^n P_(n)` `(1/4)^(n). xx .^(2n) C_(n) xx .^(2n)P_(n)``.^(n)C_(n) xx .^(n)P_(n)`
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