Question

4,7,17,30,54,89 Which is an incorrect number?​

Answer 1

Answer:

all are correct number no number is incorrect

Answer 2

Question :- 4,7,17,30,54,89 Which is an incorrect number ?

Answer :- 7

Explanation :-

checking difference of difference we get,

4 7 17 30 54 89

3 10 13 24 35

11 11

as we can see that, in last two digits we have same difference as 11,

so, making same difference as 11 in second ,

4 15 17 30 54 89

11 2 13 24 35

11 11 11

therefore, in place of 7, 15 is correct number .

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