when we use n(1+n)/2
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Step-by-step explanation:
The reason n-1 is used is because that is the number of degrees of freedom in the sample. The sum of each value in a sample minus the mean must equal 0, so if you know what all the values except one are, you can calculate the value of the final one.
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Answer:
n(1+n)/2
Step-by-step explanation:
to find the sum of n consecutive natural numbers starting from 1
1, 2, 3, 4, 5, 6, 7, 8, 9
here n = 9
9 (9+1)/2 = 9*10/2 = 9*5 = 45
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