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Formula for arithmetic progression is tn = a + (n-1)d
You are given the first 3 terms of the arithmetic progression, the first term x, and the common difference of -4.
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You want to only have y in the equation, so you need to isolate and eliminate x and z from the equations. Find Term 3.
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As the question in part b implies that the geometric progression is somehow related to the arithmetic progression, there must be common terms.
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As you would later notice the third term in the geometric progression is z, which is the same as the third term in the arithmetic progression.
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The formula for the geometric progresion is tn = ar^(n-1)
Find the second and third terms fo the geometric sequence.
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You should be able to notice that the third terms for both the geometric and arithmetic sequences can be eliminated via simultaneous equations.
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Isolate x in the second terms in both the geometric and arithmetic sequences to eliminate x (if you need to)
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Notice you need to find r in the geometric sequence in order to find the sum to infinity.
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It would really help if you note down all the relevant formulas in your answer before you start anything; it would save you from thinking as hard.
•
Formula for arithmetic progression is tn = a + (n-1)d
You are given the first 3 terms of the arithmetic progression, the first term x, and the common difference of -4.
•
You want to only have y in the equation, so you need to isolate and eliminate x and z from the equations. Find Term 3.
•
As the question in part b implies that the geometric progression is somehow related to the arithmetic progression, there must be common terms.
•
As you would later notice the third term in the geometric progression is z, which is the same as the third term in the arithmetic progression.
•
The formula for the geometric progresion is tn = ar^(n-1)
Find the second and third terms fo the geometric sequence.
•
You should be able to notice that the third terms for both the geometric and arithmetic sequences can be eliminated via simultaneous equations.
•
Isolate x in the second terms in both the geometric and arithmetic sequences to eliminate x (if you need to)
•
Notice you need to find r in the geometric sequence in order to find the sum to infinity.
•
It would really help if you note down all the relevant formulas in your answer before you start anything; it would save you from thinking as hard.
Last reply 1 day ago
Edexcel A Level Politics Paper 1 (9PL0 01) - 21st May 2024 [Exam Chat]10
Last reply 1 day ago
Edexcel A Level Politics Paper 1 (9PL0 01) - 21st May 2024 [Exam Chat]10