Question

Starting from the third term of the sequence 1, 3, 2, ..., each term is equal to the difference of that the term preceding it minus the term preceding that. Find the sum of the first 100 terms of the sequence

Answer 1

@perl

Answer 2

a1 = 1
a2 = 3
a(n) = a(n-1) - a(n-2)

Answer 3

then?

Answer 4

ok whats the answer lol

Answer 5

a(3) = a(2) - a(1)

a(4) = a(3) - a(2)

a(5) = a(4) - a(3)

do you see how they cancel if you add a(3) + a(4) + a(5)

Answer 6

ye