How many four digit even numbers can be formed using the digits {2, 3, 5, 1, 7, 9}
Correct answer: A. 60
- A. 60
- B. 360
- C. 120
- D. 240
Explanation
Only 2 is even, so the units place is fixed as 2. The remaining three places can be filled from the other 5 digits in 5 x 4 x 3 = 60 ways. The likely trap is option c, 120, from allowing an even final digit that is not present in the set.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Sequences and Series
Sequences describe ordered terms formed by a pattern, while series represent the sum of those terms. Questions cover arithmetic and geometric sequences, their nth terms, common difference or ratio, finite sums, and applications, with the sequence itself kept distinct from the corresponding series.
Practise Algebra
269 free Algebra MCQs from Mathematics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Mathematics questions like this
Mathematics is on 76 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Sequences and Series questions
A bag contains nine yellow balls, three white balls and four red balls. In how many ways can two balls be drawn from the bag?
In how many ways can three consonants and two vowels be selected from the letters of the word "TRIANGLE"?
A question paper consists of five problems, each problem having three internal choices. In how many ways can a candidate attempt one or more problems?
How many four digit numbers can be formed using the digits {1, 3, 4, 5, 7,9}(repetition of digits is not allowed)?
A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most__________?
A committee has 5 men and 6 women. What are the number of ways of selecting a group of eight persons?