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Subscript addition

  • Thread starter Robb
  • Start date
Problem Statement
Let ##F_n be the n-th Fibonacci number, where F_0=0 and F_1=1. Prove that if n is a multiple of 4, the F_n is a multiple of 3.
Relevant Equations
Can somebody please explain below

##F_{4k+4} = F_{4k+3} + F_{4k+2}##

I thought it would be

##F_{4k+4} = F_{4k+3} +F_{4k+1}##

AHHHH! Gracias!

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