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Q.

If x=16C5, y=r=13(20r)C4, z=k=14(16K)C3 then x+y+z=

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a

19×17×45

b

19×17×16

c

19×17×15

d

19×17×48

answer is D.

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Detailed Solution

x=16C5,y=19C4+18C4+17C4,z=15C3+14C3+13C3+12C3x+y+z=12C3+13C3+14C3+15C3+16C5+17C4+18C4+19C4=20C5=20.19.18.17.16120=19.17.48

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