+0  
 
0
162
0
avatar+644 

If (a_1, a_2..... a_17) satisfya

1 + a_2 + a_3 = 1, 
a_2 + a_3 + a_4 = 2, 
a_3 + a_4 + a_5 = 3, 

a_{15} + a_{16} + a_{17} = 15,
a_{16} + a_{17} + a_{1} = 16, 
a_{17} + a_{1} + a_{2} = 17,

what is the value of a_17?

 
waffles  Jan 25, 2018

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