If 56 P r -6-54 P r -3-30800- 1- then r -A- 31B- 41C- 51D- 40

The correct option is B 41 56!/(50 r)!×(51 r)!/54! = 30800/1⇒ 56× 55× (51 r) = 30800⇒ r = 41 ...

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nCr Definitions and Properties

If 56 P r +6·...

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If $^{56} P_{r + 6} .^{54} P_{r + 3}$ = 30800:1, then r =

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If $^{56} P_{r + 6} :^{54} P_{r + 3} = 30800 : 1$ , then r = 41

^{56} P_{r + 6} :^{54} P_{r + 3} = 30800 : 1

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=

If $^{56} P_{r + 6} :^{54} P_{r + 3}$ = 30800:1, then r =

^{56} P_{r + 6} :^{54} P_{r + 3} = 30800 : 1

^{r} P_{2} =

If $^{56} P_{r + 6} :^{54} P_{r + 3}$ = 30800:1, then r =

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