sequence&series

[tired crater]

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[scenic hinge]

i got it till here

not able to proceed from here

i am getting 2 but the answer they have given is 4

[vagrant tree]

i think its because of the modulus, when you manipulate the original equation you have left out the modulous

[vagrant tree]

so you have left out k=1 and k=2 here ^

when k=1 or 2, the k^2-3k+2 is zero and s_k is 1

[vagrant tree]

so there is the other 2 that gives you the right answer

[scenic hinge]

got it

thanks

+close