7 P r -840 and 7 C r -35 - Find rA- 3B- 6C- None of theseD- 4E- 5

The correct option is D 4 7!/(7 r)! = 840 7!/(7 r)!r! = 35 Divide one by the other, we get r = 4. ...

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Multiplying Terms with the Same Base

7 P r =840 an...

Question

$^{7} P_{r}$ = 840 and $^{7} C_{r}$ = 35. Find r.

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None of these

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$^{7} P_{r}$ = 840 and $^{7} C_{r}$ = 35. Find r.

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