Question

1,11,29,_,89 please solve this

Answer 1

1 , 11 , 29 , 55 , 89 ...
11 + 18 = 29
29 + 26 = 55
55 + 34 = 89
89 + 42 = 131

.........added value differences is 8

Answer 2

Here, the given sequence is 1, 11, 29, ____, 89.

We have to find the missing number. So, to find the next number we should closely observe the given sequence.

So, we can observe that the first number added to 1 is 10 then 18 and similarly if we add the difference, i.e. 8 to 18, we have to add 26 to 29. That is,

1 + 10 = 11,

11 + 18 = 29,

Accordingly for the next two,

29 + 26 = 55,

55 + 34 = 89.

Therefore, our missing number is 55.

Hence, the series becomes 1, 11, 29, 55, and 89.

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