Calculating numbers in sequences
I need to help with a math question in Russian about counting natural numbers between specific pairs: 15 to 20 and 30 to 43. So I calculate that there are 4 numbers between 15 and 20 (16, 17, 18, 19) and 12 numbers between 30 and 43 (31 through 42). The formula is simply the larger number minus the smaller number, minus one. My final answer can be formatted concisely for clarity!Verifying number ranges
I'm considering how to verify the numbers in my previous ranges: from 16 to 19 and from 31 to 42. I think I need to preserve the lowercase letters "а" and "б" for clarity. I’ll also ensure to add the next marker correctly in Russian to maintain the format. Overall, I'm focused on providing a clear and effective presentation of the answers. I want to make sure everything is accurate for the user!
Краткий ответ: а) 4 числа; б) 12 чисел.
Между двумя числами считаем только числа, не включая сами границы:
а) между \(15\) и \(20\): \(16, 17, 18, 19\) — 4 числа
\[ 20-15-1=4 \]б) между \(30\) и \(43\): от \(31\) до \(42\) — 12 чисел
\[ 43-30-1=12 \]
Правило: из большего числа вычесть меньшее и ещё \(1\).