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26 February, 02:22

For a sequence an=an-1+an-2 and a1=1, a2=2, find its first four terms

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  1. 26 February, 04:56
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    3, 5, 8, 13

    Step-by-step explanation:

    aₙ = aₙ₋₁ + aₙ₋₂

    a₃ = a₂ + a₁ = 2 + 1 = 3

    a₄ = a₃ + a₂ = 3 + 2 = 5

    a₅ = a₄ + a₃ = 5 + 3 = 8

    a₆ = a₅ + a₄ = 8 + 5 = 13
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