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The value of ( .^7C0 + ^7C1)+( .^7C1+ ^7...

The value of `( .^7C_0 + ^7C_1)+( .^7C_1+ ^7C_2)+....+(.^7C_6+ ^7C_7)` is (A) `2^7-1` (B) `2^8-2` (C) `2^8-1` (D) `2^8`

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