Question

(1) Find the minimum and maximum number of dicts in the sum of any two 4-digits number
(2) How many 5-digit numbers are there in at?​

Answer 1

Answer:

Let us first discuss the maximum:

The largest four digit number is 9999, and thus, a maximum value can be obtained by adding 9999 and 9999, and the resultant number will be having the maximum number of digits.

9999+9999=19998  

Therefore, the maximum number of digits of the resultant number, when two four-digit numbers are added is 5.

Let us now discuss the minimum:

The smallest four digit number is 1000, and thus, a minimum value can be obtained by adding 1000 and 1000, and the resultant number will be having the minimum number of digits.

1000+1000=2000  

Therefore, the minimum number of digits of the resultant number, when two four-digit numbers are added is 4.

Hope this helps.

Answer 2

Answer:

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