Question
Find the sum of the first 20 natural
numbers.Solution
Sum of first 'n' natural numbers = n(n + 1) ÷ 2
Required sum = 20 × (20 + 1) ÷ 2 = 20 × 21 ÷ 2 = 210
More No. System Questions
Solve the given equation for ?. Find the approximate value.
[(9/10 of 449.88) - (30% of 299.78)] × [(√120.91 ÷ 11) + (1/3 of 600.11)] = ?<...
(18.21)² - (12.9)² = 20% of 649.9 - ? + 400.033
√440.98 + (17.95% of 249.96 – 12% of 99.99) + (7.12)2 = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
14, 27, 40, 53, 67, 79
79.99% of (84.89 × 5.99) - (3.89)2 × 21.87 = ?
{44.78% of (11.67 × 54.78)} ÷ 2.65 = ? + 19.25
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
44.87% of (39.85 × ?) – 1520.88 0.51 = 1400.8
