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    1.2+2.3+3.4+.........+n(n+1)=n(n+1)(n+2)/3,n belongs to N

    0  Views: 470 Answers: 1 Posted: 10 years ago

    1 Answer

    Ask your instructor to explain this to you. That way, you will actually learn how to do math and you'll also remember it for the rest of your life. You need to "understand" math and not memorize it nor get the answer from someone else.

    mycatsmom

    My 9th grade algebra teacher never taught us anything. He used to just write problems on the board and solve them, but didn't tell us how he was solving them.My bro had trouble with his class too. Some teachers don't have teaching skills.
    Ducky

    Moderator
    I had one who couldn't teach geometry. He quit teaching after his first year.


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