defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Permutations and Combinations Fundamental Principles of Counting

The value of (²¹C₁ - ¹⁰C₁₎ + ⁽²¹C2 - ¹⁰C₂) + (²¹C₃ - ¹⁰C3) + (²¹C₄ - ¹⁰C4) + ______ + (²¹C₁₀ - ¹⁰C₁₀) is

1

2²¹- 2¹¹

2

2²¹- 2¹⁰

3

2²⁰- 2⁹

4

2²⁰- 2¹⁰

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