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Total Number Of 5 digit numbers of the form xyzyx where x>y is:
1)350
2)360
3)380
4)390

 

Sol->

1<X<8

0<Z<9

when x is 1,y is 2 to9

x=2,y is 3 to 9

so on.......

the total number of ways=(8+7+6+_ _ _ _+1)*10=360