Question

1, 1, 2, 3, 5, 8, 13, .....
Sum of 9th and 10th terms of above series is:

Answer 1

We can observe that every next term is sum of its last two terms......


So the series is


●1,1,2,3,5,8,13,(13+8)=21,(21+13)=34, (34+21)=55,.......


Now,

We have 9th term of the series = 34
and 10th term of the series = 55


Therefore sum of 9th and 10th term
= 34+55
= 89........


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