Question

99+98-97+96-95+...+2-1

Answer 1

ответ на твой вопрос : 5000

Answer 2

It looks like you're asking for the sum of a sequence where you're alternating between adding and subtracting consecutive numbers. The sequence you've provided seems to go from 99 down to 1.

To calculate the sum of this sequence, you can pair up the numbers that are added and subtracted:

(99 + 98) - (97 + 96) - (95 + 94) - ... - (3 + 2) - 1

Each pair adds up to 197, and there are 49 such pairs. So, the sum can be calculated as:

Sum = 197 * 49 - 1

Sum = 9649 - 1

Sum = 9648

The sum of the sequence is 9648.