Question Details

For the sequence provided below, determine the incorrect term:

2, 4, 7, 13, 19, 30, 43

Options

A

19

B

13

C

30

D

4

E

7

Show Answer

Correct Answer :

Option B

13

Solution :

The correct answer is Option 13 (or 13).


Step-by-step Explanation:


Let us analyze the given sequence to find the pattern governing the terms:

2,4,7,13,19,30,43


Let us check the differences between consecutive terms:

4 - 2 = 2

7 - 4 = 3

19 - 13 = 6

30 - 19 = 11

43 - 30 = 13


Now, let us examine the differences between the terms when we replace 13 with the correct term that fits the pattern of differences:

Notice the differences between terms: 2, 3, 5, 7, 11, 13 (which is the sequence of prime numbers).


Let us verify this prime number difference pattern starting from the first term 2:

First term = 2

Second term = 2 + 2 = 4

Third term = 4 + 3 = 7

Fourth term = 7 + 5 = 12

Fifth term = 12 + 7 = 19

Sixth term = 19 + 11 = 30

Seventh term = 30 + 13 = 43


Therefore, the fourth term in the given sequence should be 12 instead of 13.


Hence, the incorrect term in the sequence is 13.

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