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If C0+C1+C2+…………+Cn=256, then ^(2n)C2 is...

If `C_0+C_1+C_2+…………+C_n=256`, then `^(2n)C_2` is equal to:

A

110

B

120

C

130

D

None of these

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JBD PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXAMPLE
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  6. How many 3-digit even numbers can be formed from the digits 1, 2, 3, 4...

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  7. How many 3-digit even numbers can be formed from the digits 1, 2, 3, 4...

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  8. How many 3-digit numbers are there without repetition?

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  9. If 1/(6!)+1/(7!)=x/(8!), find x

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  10. Show that (2n)!/n!=[1.3.5……………….(2n-1)]2^n.

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  12. How many numbers are there between 1000 and 9999 so that no digit is r...

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  16. If nC6=nC2, find ^nC2.

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