defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Binomial Theorem Binomial Expansion

What is C(n, 1) + C(n, 2) + _ _ _ _  _ + C(n, n) equal to

1
2 + 22 + 23 + _ _ _ _ _  + 2n
2
1 + 2 + 22 + 23 + _ _ _ _ _ + 2n
3
1 + 2 + 22 + 23 + _ _ _ _ _ _ + 2n - 1
4
2 + 22 + 23 + _ _ _ _ _ + 2n - 1
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