What is the arithmetic mean of the first 100 natural numbers?
Solution
Correct Answer: Option B
আমরা জানি ,
1+2+3...+n=n(n+1)/2
∴1+2+3...+...+100=100(100+1)/2
=(100×101)/2
=50×101
=5050
∴ গড় =5050/100=50.5
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