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two ap's have the same common difference . the first two terms of one of these is -3 and not the other is -7 .Find the difference between their 4th terms.
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Understanding Arithmetic Progressions (AP)
An arithmetic progression (AP) is a sequence of numbers in which the difference between consecutive terms is constant. This constant is known as the common difference (d).
Given Information
- Two APs with the same common difference (d).
- First AP: First term (a1) = -3
- Second AP: First term (a2) = -7
Finding the Terms
For an AP, the nth term can be expressed as:
- For the first AP:
- Tn1 = a1 + (n-1)d
- For the second AP:
- Tn2 = a2 + (n-1)d
Calculating the 4th Terms
1. 4th term of the first AP:
- T4_1 = -3 + (4-1)d
- T4_1 = -3 + 3d
2. 4th term of the second AP:
- T4_2 = -7 + (4-1)d
- T4_2 = -7 + 3d
Finding the Difference
To find the difference between the 4th terms of both APs, we calculate:
- Difference = T4_1 - T4_2
- Difference = (-3 + 3d) - (-7 + 3d)
Simplifying the Expression
- The common difference (3d) cancels out:
- Difference = -3 + 3d + 7 - 3d
- Difference = 4
Conclusion
The difference between the 4th terms of the two arithmetic progressions is 4. This demonstrates that while the starting points of the sequences differ, their progression remains consistent due to the common difference.
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two ap's have the same common difference . the first two terms of one of these is -3 and not the other is -7 .Find the difference between their 4th terms.
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