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Undefined Term (Posted on 2008-03-14) Difficulty: 2 of 5

There is a sequence defined by using common mathematical operations.
The first two terms in the sequence are 10 and 12 and the sixth term is 60. The seventh term, however, is undefined.
What are the third, fourth and fifth terms?

See The Solution Submitted by Brian Smith    
Rating: 2.0000 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution Solution | Comment 1 of 6

The nth term of the sequence can be given by the expression
60/(7-n).  From this, the third, fourth and fifth terms are
15, 20, and 30.

   n:  1     2     3     4     5     6     7     8     9  ...
term: 10    12    15    20    30    60  undef. -60   -30  ...


  Posted by Dej Mar on 2008-03-14 12:30:05
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