What is the Arithmetic mean of the first $n$ natural numbers?

  • A
    $\frac{n+1}{2}$
  • B
    $\frac{n^2(n+1)}{2}$
  • C
    $2(n+1)$
  • D
    $\frac{n(n+1)}{2}$

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Similar Questions

Find the square root of $(2.25)^{2} + 16 - 4(2.25) - \frac{(2.25)^{3}}{2.25 + 4} ?$

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If $\frac{x}{y} = \frac{3}{4}$,then the value of $\left(\frac{6}{7} + \frac{y-x}{y+x}\right)$ equals:

$\frac{(0.188+0.077)^{2}+(0.188-0.077)^{2}}{0.188 \times 0.188+0.077 \times 0.077} = ?$

$18 \times 16 - 3445 \div 13 = ? - 344$

The sum of the digits of a two-digit number is $15$ and the difference between the digits is $3$. What is the two-digit number?

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