Unless you are using Excel 2007 you can't use whole column references with SUMPRODUCT. Just make sure that each range is the same size. Also -- is less 'expensive' for coercion than *.
Huawei P10 review
1995-2015: How technology has changed the world in 20 years
How Nearly Normal created super-fun papercraft for Google
47 iPhone camera tips to help you take better photos
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.