(b) For any n ≥ 1, the factorial function, denoted by n!, is the product of all the positive integers through n: n! = 1.2.3.. ... (n − 1) · n Prove that for n ≥ 4, n! > 2n.

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Chapter2: Second-order Linear Odes
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(b) For any n ≥ 1, the factorial function, denoted by n!, is the product of all the positive integers through n:
n! = 1.2.3... (n − 1) · n
Prove that for n ≥ 4, n! > 2n.
n
Prove thatforn×1, Σ
1
j²
≤2
1
n
Transcribed Image Text:(b) For any n ≥ 1, the factorial function, denoted by n!, is the product of all the positive integers through n: n! = 1.2.3... (n − 1) · n Prove that for n ≥ 4, n! > 2n. n Prove thatforn×1, Σ 1 j² ≤2 1 n
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