The value of (.^(21)C(1) - .^(10)C(1)) +...

The value of `(.^(21)C_(1) - .^(10)C_(1)) + (.^(21)C_(2) - .^(10)C_(2)) + (.^(21)C_(3) - .^(10)C_(3)) + (.^(21)C_(4) - .^(10)C_(4)) + "…." + (.^(21)C_(10) - .^(10)C_(10))` is

`2^(20)-2^(10)`

`2^(21)-2^(11)`

`2^(21)-2^(10)`

`2^(20)-2^(9)`

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