Skip to main content
Mathematics

All Questions

Ask Question
Tagged with
166 questions
Newest Active Bountied Unanswered
-2 votes
3 answers
70 views

Find the sum of all products of two distinct naturals, neither exceeding 2015. [closed]

Find the sum $$(1\cdot2)+(1\cdot3)+(1\cdot4)+\cdots+(1\cdot2015)+(2\cdot3)+(2\cdot4)+\cdots+(2\cdot2015)+\cdots+(2014\cdot2015)$$ any help? I tried with telescope but got nothing
IKXJ's user avatar
IKXJ
  • 1

15 30 50 per page
1
…
8 9 10 11
12