Principle - 3CC

According to a certain principle, we divided three-digit natural numbers into two groups:
The 1st group includes, for example, the numbers:
158, 237, 689, 982, 731, 422, . ..
The 2nd group includes, for example, the numbers:
244, 385, 596, 897, …

Discover the division principle and classify the following numbers into the correct group:
A) 632
B) 357
C) 841
D) 779

Correct answer:

A =  2
B =  2
C =  1
D =  1

Step-by-step explanation:

$$\begin{gathered} 1 \\ 158=2\times 79 \\ 237=3\times 79 \\ 689=13\times 53 \\ 982=2\times 491 \\ 731=17\times 43 \\ 422=2\times 211 \\ 2 \\ 244=2\times 2\times 61 \\ 385=5\times 7\times 11 \\ 596=2\times 2\times 149 \\ 897=3\times 13\times 23 \\ 632=2\times 2\times 2\times 79 \\ A=2 \end{gathered}$$

$$\begin{gathered} 357=3\times 7\times 17 \\ B=2 \end{gathered}$$

$$\begin{gathered} 841=29\times 29 \\ C=1 \end{gathered}$$

$$\begin{gathered} 779=19\times 41 \\ D=1 \end{gathered}$$

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