Question

How many whole numbers lie between 1000 and 2000?

Answer 1

Answer:

$999$

Step-by-step explanation:

$arithmatic \: progression \: \: 1001 \: \: \: \: 1002 \: \: \: \: 1003 \:... \: \: \: \: \: \: \: \: \: \: \: \: \: 1999 (last \: term)\\ \\ 1999 = 1001 + (x - 1) \times 1 \\ \\ 1999 - 1001 = x - 1 \\ \\ x = 1999 + 1 - 1001 \\ \\ x = 1999 - 1000 \\ \\ x = 999 \: \: \: (answer)$