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Combination

If 10C4=10C...

Question

If $^{10} C_{4} =^{10} C_{s}$ . Find $s$ for $s \neq 4$ .

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Solution

We have $^{n} C_{r} =^{n} C_{n - r}$ .
Now, $^{10} C_{4} =^{10} C_{6}$
$∴ s = 6$ .

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A

+

B

-,

C

\times

, then what is the value of

(10 C 4) + (4 C 4) B 6 ?

T_{n} = 5 n - 2

S_{4}

Q. If 'A' stands for

+

, 'B' stands for

-

, 'C' stands for

\times

, then what is the value of (10C4)A(4C4)B6?

S_{4} : S_{8}

for the series 4 + 12 + 36 + .............

S_{2} : S_{4}

for the series 5 + 10 + 20 + ............

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