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In which place is 7 in the following numbers in the national numeration system?

a) 2378
b) 22307
c) 44289782
d) 720081810

Sagot :

GinnyAnsweridn
Sure, let's determine the position of the digit 7 in each of the given numbers. Here’s the detailed step-by-step solution:

(a) 2378
- We look at the number 2378.
- Observing the digits from left to right: 2, 3, 7, 8.
- Here, the digit 7 appears in the 3rd position.

(b) 22307
- We look at the number 22307.
- Observing the digits from left to right: 2, 2, 3, 0, 7.
- In this number, the digit 7 appears at the 5th position.

(c) 44289782
- We look at the number 44289782.
- Observing the digits from left to right: 4, 4, 2, 8, 9, 7, 8, 2.
- Here, the digit 7 appears in the 6th position.

(d) 720081810
- We look at the number 720081810.
- Observing the digits from left to right: 7, 2, 0, 0, 8, 1, 8, 1, 0.
- In this number, the digit 7 appears at the 1st position.

So, the positions of the digit 7 in the given numbers are:

(a) 2378: 3rd position
(b) 22307: 5th position
(c) 44289782: 6th position
(d) 720081810: 1st position
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