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Question

Find the first six terms of the sequence given by
a1=a2=a3=1 and an=an1+an2 for n>3

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Solution

The given sequence is an=an1+an2 where the first three terms are a1=a2=a3=1.

The next three terms of the sequence an=an1+an2 usinga1=a2=a3=1 can be determined as follows:

a4=a41+a42=a3+a2=1+1=2

a5=a51+a52=a4+a3=2+1=3

a6=a61+a62=a5+a4=3+2=5

Hence, the first six terms of the sequence an=an1+an2 are 1,1,1,2,3,5....


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