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प्रश्न
If the mean of the first n natural numbers is 20, then n = ______.
रिकाम्या जागा भरा
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उत्तर
If the mean of the first n natural numbers is 20, then n = 39.
Explanation:
The mean of the first n natural numbers is `(n + 1)/2`.
Thus, `(n + 1)/2 = 20`, giving n = 39.
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