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Free webinar on Robotics (Block Chain) Learn to create a Robotic Device Using Arduino
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The number of ways in which 10 candidates a1 a2 ..... a10 can be ranked such that a1 is always above a10 ? The number of ways in which 10 candidates a1 a2 ..... a10 can be ranked such that a1 is always above a10 ?
9! + 8x8! + 8x7x7! + 8x7x6x6! +…......+ 8!= 9! + 8x8! + 7x8! + 6x8! +...............+ 8!= 9x8! + 8x8! + 7x8! + 6x8! +...........+8!=8!(9+8+7+.......+1)=8!x9x5=9!x5
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