Mathematics · Infinite Series and Exponential Series

The coefficient of xn in the expansion of e7x + exe3x is:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

14n-1 + (-2)nn!
24n-1 + 2nn!
34n + (-2)nn!✓
44n-1 + (-2)n-1n!

Correct answer

4n + (-2)nn!

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