Is 5/7 A Natural Number

Mean natural first if numbers then number value now If the mean of first 'n' natural number is 15, then what is the value

If the mean of first 'n' natural number is 15, then what is the value

If the mean of first 'n' natural number is 15, then what is the value

If the mean of first 'n' natural number is 15, then what is the value

If the mean of first 'n' natural number is 15, then what is the value

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