Here's a sequence:
2, 4, 8, 13, 20, 29, _, _.
What numbers go into the blanks, and what is the rule for the sequence?
every two numbers add up to a number that is related to the next number.
in the biginning third number - sum = 2. then forth number - sum =1. then fifth number - sum = -1. as you can see the solutions to these equations is :2,1,-1,-4 that means the difference between each solution is growing in 1 numver each time. that means the next "solutions" are -8 and then -13.
20+29-8=41..... 29+41-13=57
and thats my answer...
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Posted by ohad
on 2003-07-29 03:35:15 |
answer
