Question
Find the sum of the first 60 natural
numbers.Solution
Sum of first 'n' natural numbers = n(n + 1) ÷ 2
Required sum = 60 × (60 + 1) ÷ 2 = 60 × 61 ÷ 2 = 1830
To change mode of myfile to 'rwxr–r–' , the command used is
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