IFoA Exam IFoA_CAA_M0 Topic 5 Question 73 Discussion

Actual exam question for IFoA's IFoA_CAA_M0 exam

Question #: 73
Topic #: 5

[All IFoA_CAA_M0 Questions]

The first term of an arithmetic sequence is 12 and the ninth term is 68.

Calculate the sum of the first 18 terms.

A1,165

B1,287

C1,350

D1,413

Show Suggested Answer

Suggested Answer: B

by Bulah at Sep 19, 2024, 05:57 PM

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Desiree

9 months ago

I'm feeling a bit unsure about this one. Let me re-read the question and double-check my work. Hmm, I'm going to go with B) 1,287 for now, but I'm not 100% confident.

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King

9 months ago

Haha, easy peasy! This is like arithmetic sequence 101. The answer is obviously C) 1,350. Anyone who got that wrong must have been sleeping during class.

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Ronny

8 months ago

Haha, easy peasy! This is like arithmetic sequence 101. The answer is obviously C) 1,350. Anyone who got that wrong must have been sleeping during class.

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Annamae

8 months ago

D) 1,413

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Paris

9 months ago

C) 1,350

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Samuel

9 months ago

B) 1,287

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Leonida

9 months ago

A) 1,165

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Whitney

10 months ago

So the sum of the first 18 terms would be 18/2 * (12 + 68) = 18/2 * 80 = 720.

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Bernardine

10 months ago

The common difference is 8.

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Whitney

10 months ago

I think we need to find the common difference first.

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Hillary

10 months ago

This looks like a tricky one, but I think I've got it. The answer has to be D) 1,413. I double-checked my work, and that's the only one that makes sense.

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Bobbye

9 months ago

Great job! D) 1,413 is the correct answer for the sum of the first 18 terms.

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Rebbecca

9 months ago

I agree, I also got D) 1,413 as the sum of the first 18 terms.

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Ashlee

9 months ago

I think you're right, the answer is D) 1,413.

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Lorita

10 months ago

I'm pretty sure the answer is B) 1,287. The common difference is 7, and the sum of the first 18 terms is the classic arithmetic sequence formula.

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Dominic

10 months ago

Okay, let's think this through step-by-step. The first term is 12 and the ninth term is 68. We need to find the common difference and then use the formula for the sum of an arithmetic sequence.

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