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The roll numbers of students in a college are alpha-numeric sequences

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GMAT 1: 570 Q40 V28
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The roll numbers of students in a college are alpha-numeric sequences  [#permalink]

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New post 08 Apr 2018, 23:55
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  45% (medium)

Question Stats:

60% (02:14) correct 40% (03:31) wrong based on 25 sessions

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The roll numbers of students in a college are alpha-numeric sequences of 6 characters. The first and fourth characters are letters while the other four are non-zero digits. While the first character is a vowel, the fourth is a letter from a to e (both inclusive). The second character is 2 and the third is a multiple of 2. The sixth character is 5 more than the fifth. How many roll numbers can be formed?
Source- time4education


a.200
b.240
c.300
d.360
e.400

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Re: The roll numbers of students in a college are alpha-numeric sequences  [#permalink]

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New post 09 Apr 2018, 00:25
Nixondutta wrote:
The roll numbers of students in a college are alpha-numeric sequences of 6 characters. The first and fourth characters are letters while the other four are non-zero digits. While the first character is a vowel, the fourth is a letter from a to e (both inclusive). The second character is 2 and the third is a multiple of 2. The sixth character is 5 more than the fifth. How many roll numbers can be formed?
Source- time4education


a.200
b.240
c.300
d.360
e.400


let 6 digit be abcde

For a=5 ways a,e,i,o,u
For b=1 way '2'
For c=4 ways 2,4,6,8
For d=5 ways a,e,b,c,d
For e=4 ways 1,2,3,4
If e=1, f=6
For f= 1 way

Total ways=5*1*4*5*4*1=400

E
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Re: The roll numbers of students in a college are alpha-numeric sequences &nbs [#permalink] 09 Apr 2018, 00:25
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The roll numbers of students in a college are alpha-numeric sequences

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