{"result":{"text":"begin mathsize 14px style sum from r equals 0 to n of open parentheses r plus 1 close parentheses to the power of n C subscript r x to the power of r equals open parentheses 1 plus x close parentheses to the power of n plus n x open parentheses 1 plus x close parentheses to the power of n minus 1 end exponent end style"},"status":"ok"}