Question

Chemy ravna symma chisel 159 i nechetnogo chisla,sledyushego za chislim 399?

Answer 1

399+1=400-то самое число
400+159=559-сумма
Ответ:Сумма равна 559

Answer 2

Sum of Even and Odd Numbers

To find the sum of even and odd numbers, we can use the following formulas:

Sum of n Even Numbers = n(n+1)

Sum of n Odd Numbers = n^2

Let's calculate the sum of even and odd numbers as per the given question.

Sum of Even Numbers

The sum of the first n even numbers is given by the formula: n(n+1).

For the number 159, we need to find the sum of the first 159 even numbers.

Using the formula, the sum of the first 159 even numbers is: 159(159+1) = 159 * 160 = 25440

Sum of Odd Numbers

The sum of the first n odd numbers is given by the formula: n^2.

For the number 399, we need to find the sum of the first 399 odd numbers.

Using the formula, the sum of the first 399 odd numbers is: 399^2 = 159201

Conclusion

The sum of the first 159 even numbers is 25440, and the sum of the first 399 odd numbers is 159201.