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In a puzzle game, Tran was given the word STRUM. How many un [#permalink]
 08 May 2018, 11:37
Question Stats:
80% (00:31) correct
20% (01:12) wrong based on 15 sessions
In a puzzle game, Tran was given the word STRUM. How are many unique three-letter arrangements possible using the letters of the word? A. 15 B. 60 C. 90 D. 120 E. 240
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Re: In a puzzle game, Tran was given the word STRUM. How many un [#permalink]
08 May 2018, 19:47
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Just to make sure I did this right: To form a 3 letter word from availabe 5 letters, it will be 5*4*3=60, right?
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Re: In a puzzle game, Tran was given the word STRUM. How many un [#permalink]
09 May 2018, 09:55
Yes. Absolutely right. Regards
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Re: In a puzzle game, Tran was given the word STRUM. How many un [#permalink]
04 Dec 2018, 03:27
Hi, I have doubt. The question asked for unique 3 letter arrangement. Means the same words should not repeat.
o find the number of different words = 9*8*7 / 3*2*1 = 10. Please share your comments
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Re: In a puzzle game, Tran was given the word STRUM. How many un [#permalink]
04 Dec 2018, 07:03
anversha wrote: Hi, I have doubt. The question asked for unique 3 letter arrangement. Means the same words should not repeat.
o find the number of different words = 9*8*7 / 3*2*1 = 10. Please share your comments No, that won't be correct.. By doing 5*4*3/3*2*1, you will get selection of 3 letters and not arrangements.. So you get 10 selection, and each selection has three different letters which can be further arranged in 3! Ways, so 10*3!=60
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Some useful Theory.
1. Arithmetic and Geometric progressions : https://greprepclub.com/forum/progressions-arithmetic-geometric-and-harmonic-11574.html#p27048
2. Effect of Arithmetic Operations on fraction : https://greprepclub.com/forum/effects-of-arithmetic-operations-on-fractions-11573.html?sid=d570445335a783891cd4d48a17db9825
3. Remainders : https://greprepclub.com/forum/remainders-what-you-should-know-11524.html
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5. Absolute Modulus and Inequalities : https://greprepclub.com/forum/absolute-modulus-a-better-understanding-11281.html
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Re: In a puzzle game, Tran was given the word STRUM. How many un
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04 Dec 2018, 07:03
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