AP EAMCET201823 Apr 2018Morning ShiftMathematicsPermutation and CombinationActual
Let S= 0,1,2,3, , 100 . The number of ways of selecting x, y S such that x y and x+y=100 is
Options
- A51
- B40
- C50
- D100
Correct answer
C. 50
Step-by-step solution
Let S= 0,1,2,3, , 100 x, y s . and x+y=100 If x=0 , y=100x=1 , y=99x=49 y=51 In this way, the total pairs in 50 . So, the number of required ways =50