Fill in the blanks.
.If we add 1 to the greatest six-digit number, we get the `underline"P"` seven-digit number. The number is `underline"Q"`
.When numbers are placed sequentially from the smallest to the greatest, they are said to be arranged in `underline"R"` order.

Options

A. `{:("P","Q","R"),("smalles",10000000,"ascending"):}`
B. `{:("P","Q","R"),`("largest",1000000,"descending"):}`
C. `{:("P","Q","R"),("smallest",9999999,"descending"):}`
D. `{:("P","Q","R"),`("largest",999999,"ascending"):}`

Answer

To solve the question step by step, let's break down the information provided:

1. **Identify the greatest six-digit number**:
The greatest six-digit number is 999,999.

2. **Add 1 to the greatest six-digit number**:
When we add 1 to 999,999, we get:
\[ 999,999 + 1 = 1,000,000 \]
This is a seven-digit number.

3. **Fill in the blanks**:
- The seven-digit number we obtained is **P** = 1,000,000.
- The number is **Q** = 1,000,000.

4. **Understanding the arrangement of numbers**:
When numbers are placed sequentially from the smallest to the greatest, they are said to be arranged in **R** = ascending order.

So, the filled blanks are:
- P = 1,000,000
- Q = 1,000,000
- R = ascending

### Final Answer:
- P = 1,000,000
- Q = 1,000,000
- R = ascending