About 1 / 3 down the page there is an explanation for how to do the sum by grouping.
]]>http://www.mathisfunforum.com/profile.php?id=337902013-02-06T07:33:55Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252196#p252196Wow,that works perfectly ,why does it work?]]>2013-02-06T06:55:36Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252192#p252192Hi;]]>http://www.mathisfunforum.com/profile.php?id=337902013-02-06T06:36:12Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252189#p252189Thank you but that formulae is for nth fibonacci number,i want a formula for the sum of fibonacci numbers from 1st to nth fibonacci number(nth series)]]>2013-02-06T05:28:11Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252188#p252188Hi;
Welcome to the forum. There simplest is called the Binet formula.
]]>http://www.mathisfunforum.com/profile.php?id=337902013-02-06T02:55:15Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252162#p252162Is there any formulae for finding nth fibonacci series?]]>2013-02-06T02:13:41Zhttp://www.mathisfunforum.com/viewtopic.php?pid=252160#p252160