Question

The customers at the bank would like to withdraw money from the automated teller machine. Help them enter their personal ID numbers by completing the numeric patterns.

0, 1, 3, 6, 10, 15, 21,

Answer 1

We see here, from the first number to the second number, we add 1.
From the second number to the third number, we add 2.
From the third number to the fourth number, we add 3, so on and so on.

Therefore, the pattern is : From the second gap moving on, the addition moves up 1.

So, we can continue the pattern by adding 7,8,9,10,etc.
-> 0,1,3,6,10,15,21,28,36,45,55,66,78,91,...