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In "^7C7+^8C7+^9C7+^(10)C7+.......+^(20)...

In `"^7C_7+^8C_7+^9C_7+^(10)C_7+.......+^(20)C_7=`
1. `"^21 C_8`
2. `"^21 C_(13)`
3. Neither 1 nor 2. 4. Both 1 and 2

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