Question

Сумма 1-2+3-4+5-6+…[phone] равна.

Answer 1

Примерно 88000 но это не точно

Answer 2

To find the sum of the given series, you can pair up the terms into consecutive pairs and observe that each pair has the same value with opposite signs.

The first pair is: 1 - 2 The second pair is: 3 - 4 The third pair is: 5 - 6

And so on...

So, the sum of each pair is (-1), and there are a total of 1000 such pairs (1999-2000 will also be one such pair).

Now, to find the sum of all the pairs, we can multiply the value of each pair (-1) by the number of pairs (1000):

Sum = -1 * 1000 = -1000

Therefore, the sum of the series 1 - 2 + 3 - 4 + 5 - 6 + ... + 1999 - 2000 is -1000.