True or False?
0 ! 1 + 1 ! 1 + 2 ! 1 + 3 ! 1 + 4 ! 1 + ⋯ = 0 ! 0 + 1 ! 1 + 2 ! 2 + 3 ! 3 + 4 ! 4 + ⋯
Notation : ! denotes the factorial notation. For example, 8 ! = 1 × 2 × 3 × ⋯ × 8 .
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So 0 ! 0 + 1 ! 1 + 2 ! 2 + 3 ! 3 + 4 ! 4 + ⋯
can be rewritten as 0 ! 0 + 1 ! 1 + 2 ∗ 1 2 + 3 ∗ 2 ! 3 + 4 ∗ 3 ! 4 + ⋯
⟹ 0 ! 0 + 1 ! 1 + 2 ∗ 1 2 + 3 ∗ 2 ! 3 + 4 ∗ 3 ! 4 + ⋯
⟹ 0 ! 0 + 0 ! 1 + 1 ! 1 + 2 ! 1 + 3 ! 1 + ⋯ Note: 0! = 1, which also meant 0!=1!
Which is the same thing as e = 0 ! 1 + 1 ! 1 + 2 ! 1 + 3 ! 1 + ⋯
Therefore, the answer is True