What is the sum of the odd integers from 45 to 65, inclusive?

Correct.
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To find the sum of the odd numbers from 45 to 65 inclusive, do the following steps:
1. Calculate the average:
>>$$\text{Average} = \frac{45+65}{2} = \frac{110}{2} = 55$$
2. Calculate the number of terms:
>>$$\text{Number of terms} = \frac{65-45}{2} + 1 = \frac{20}{2} + 1 = 11$$
3. Multiply the average by the number of terms:
>>$$\text{Sum} = 55 \times 11 = 605$$

Incorrect.
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For example, to find the sum of odd integers from 7 to 17, do the following steps:
1. Calculate the average:
>>$$\text{Average} = \frac{7+17}{2} = \frac{24}{2} = 12$$
2. Calculate the number of terms:
>>$$\text{Number of terms} = \frac{17-7}{2} + 1 = \frac{10}{2} + 1 = 6$$
3. Multiply the average by the number of terms:
>>$$\text{Sum} = 6 \times12 =72$$

Incorrect.
[[Snippet]]
For example, to find the sum of odd integers from 7 to 17, do the following steps:
1. Calculate the average:
>>$$\text{Average} = \frac{7+17}{2} = \frac{24}{2} = 12$$
2. Calculate the number of terms:
>>$$\text{Number of terms} = \frac{17-7}{2} + 1 = \frac{10}{2} + 1 = 6$$
3. Multiply the average by the number of terms:
>>$$\text{Sum} = 6 \times12 =72$$

Incorrect.
[[Snippet]]
For example, to find the sum of odd integers from 7 to 17, do the following steps:
1. Calculate the average:
>>$$\text{Average} = \frac{7+17}{2} = \frac{24}{2} = 12$$
2. Calculate the number of terms:
>>$$\text{Number of terms} = \frac{17-7}{2} + 1 = \frac{10}{2} + 1 = 6$$
3. Multiply the average by the number of terms:
>>$$\text{Sum} = 6 \times12 =72$$

495

550

555

600

605