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Bunuel
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AryakiSekera
This question took me 7 minutes to solve. Please help figure out a faster way to solve it and links to similar questions for practice would be much appreciated


Sequences

THEORY:

Sequences Made Easy - All in One Topic!
Math : Sequences & Progressions
Time to Tackle Geometric Progressions!

QUESTIONS:

Special Numbers and Sequences Problems
PS Questions

For other subjects:
ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread­

Hope this helps.­
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Can you explain the flower calculation bit in detail?
Bunuel
Official Solution:


The question first asks us to find \(H_{6}\).

Let’s list do the calculations for the first few terms:

- \(H_{3} = H_{2} + 2 * H_{1} = 5 + 2 * 3 = 11\)

- \(H_{4} = H_{3} + 2 * H_{2} = 11 + 2 * 5 = 21\)

- \(H_{5} = H_{4} + 2 * H_{3} = 21 + 2 * 11 = 43\)

- \(H_{6} = H_{5} + 2 * H_{4} = 43 + 2 * 21 = 85\)

Now the question asks us to find the total number of flower produced from year 1 to 6.

Let’s write out a table with the number of flowers made each year.

Year12 3456
Flowers produced\(H_{1} * 0\)0\(H_{3} * 1\)0\(H_{5} * 2\)0



Or:

Year123456
Flowers produced00110860



That means the total number of flowers will be 86 + 11 = 97.

Our answer will be: \(H_{6} - 85\) and Flowers - 97.


Correct answer:

\(H_{6}\) "85"

Flowers "97"
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Can you explain the flower calculation bit in detail?


The tree produces flowers only in odd years, and the number of flowers in year 2n+1 is given by H(2n+1) * n.

From year 1 to 6, the odd years are 1, 3, and 5:

Year 1: n = 0, flowers = H1 * 0 = 0
Year 3: n = 1, flowers = H3 * 1 = 11 * 1 = 11
Year 5: n = 2, flowers = H5 * 2 = 43 * 2 = 86

Total flowers = 0 + 11 + 86 = 97.
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Hi Bunuel, why is n = 0 for the year 1? please explain this part
Bunuel


The tree produces flowers only in odd years, and the number of flowers in year 2n+1 is given by H(2n+1) * n.

From year 1 to 6, the odd years are 1, 3, and 5:

Year 1: n = 0, flowers = H1 * 0 = 0
Year 3: n = 1, flowers = H3 * 1 = 11 * 1 = 11
Year 5: n = 2, flowers = H5 * 2 = 43 * 2 = 86

Total flowers = 0 + 11 + 86 = 97.
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SwethaReddyL
Hi Bunuel, why is n = 0 for the year 1? please explain this part

Please check the post just above yours HERE. Hope it helps.
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