Question

 5, 7, 10, 11, 15, 15, 20,…………..

(A)  22

(B)  19

(C)  20

(D)  21

Answer 1

19 is the answer.

7 - 5 = 2

10 - 7 = 3

11 - 10 = 1

15 - 11 = 4

15 - 15 = 0

20 - 15 = 5

19 - 20 = - 1

Here look at the pattern carefully starting from 2 every alternate no. 2, 1, 0 , - 1 are decreasing by 1.

And starting from 3 every no. Is increasing by 1
like 3, 4, 5.

Hopefully it will clear ur logic.


Thanks

Answer 2

Answer: 19

5, 7, 10, 11, 15, 15, 20.

Step-by-step explanation:

Note the pattern.

5x1 = 5 (1st digit)

5x2 = 10 (3rd digit)

5x3 = 15 (5th digit)

5x4 = 20 (7th digit)

....

7+4=11 (4th digit)

11+4=15 (6th digit)

15+4=19 (the answer) (8th digit)

I THINK IT FOLLOWS TWO PATTERN SIMULTANEOUSLY BUT BOTH ARE NOT RELATED.

They're just to provide you a sense of pattern.

Therefore, the answer is 19.

Not sure if my thinking process is right.