1.

""^20C_0 + ""^20C_1 + ""^20C_2+…….+""^20C_10 =

Answer»

`[2^19 - 1/2. ""^18C_10]`
`[2^19 +1/2.""^20C_10]`
`2^19-1/4. ""^18C_10]`
`[2^19 - 1/4 . ""^6C_3]`

ANSWER :B


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