Question

Guess the last number in the given series
12, 33, 74, 45, 36,
(I lote: Answer must contain only digits without any additional space​

Answer 1

Given : 12, 33, 74, 45, 36,

To find : last number in the given series

Solution:

12, 33, 74, 45, 36,

Taking Tens digit  1st

1     3       7        4          3

1²  = 1

2² - 1  = 3

3² - 2 = 7

4² - 3  = 13  = 1  + 3 = 4

5² - 4 = 21 =  2 + 1  = 3

6² - 5  = 31  = 3 + 1 = 4

n² - (n - 1)   digits added until converted in single digit

Digits at unit place

2    3     4     5    6    

so next digit would be 7  

n + 1  

Hence next number in series should be 47.

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