In book “Mastering bitcoin” 3rd, page 278, There is a formula about bitcoin mining difficulty adjustment formula as below:
New Target = Old Target * (20,160 minutes / Actual Time of Last 2015 Blocks)
I think it should be:
New Target = Old Target * (Actual Time of Last 2015 Blocks / 20,160 minutes)
Anyone has comments about it? Thanks.











