GR0568 problem 25 help!
Posted: Thu Aug 20, 2009 1:15 am
I am trying this problem -
{a_n} is a recursively defined sequence with a_{n+1} = (n+2)/n * a_n . The problem asks for a_30. The answer I get is 32!/(30!*3!) . I checked the asnwer on matlab and it is correct. But it is not one of the choices given. Instead it says the correct answer is choice A which is (15)(31) - my question is what does (15)(31) mean, I have never seen this symbol before.
Any help would be appreciated. Thanks!
{a_n} is a recursively defined sequence with a_{n+1} = (n+2)/n * a_n . The problem asks for a_30. The answer I get is 32!/(30!*3!) . I checked the asnwer on matlab and it is correct. But it is not one of the choices given. Instead it says the correct answer is choice A which is (15)(31) - my question is what does (15)(31) mean, I have never seen this symbol before.
Any help would be appreciated. Thanks!