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. ...

You visited us 2 times! Enjoying our articles? Unlock Full Access!

Multiplying Terms with the Same Base

7 P r =840 an...

Question

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

None of these

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

Suggest Corrections

Similar questions

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

\frac{1}{2} (5 + 6)

\sqrt{5 + 6}

\sqrt{5 \times 6}

A = {(r, s) | r < s; r, s \in W}

A

^{7} C_{r} +^{7} C_{r - 1} =^{8} C_{s}

If $A = 3^{46}, B = 3^{0} + 3^{1} + 3^{2} + 3^{3} + 3^{4} + 3^{5} + 3^{6} + . . . . . . . . . + 3^{46},$ then A-B =

Join BYJU'S Learning Program