Words of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J. Let X be the no| IIT JEE| 17JAN

Words of length 10 are formed using the letters A,B,C,D,E,F,G,H,I,J. Let X be the number of such words where no letter is repeated and Y be the number of such words where exactly one letter is repeated twice and no other Letter is repeated. Then Y + X is ?
A. 44* 10!
B. 45* 10!
C. 46* 10!
D. 47* 10!