This GRE test consists of permutations and combinations questions which are part of the GRE Quantitative section.
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A five-digit number is formed using digits 1, 3, 5, 7 and 9 without repeating any one of them. What is the sum of all such possible numbers?
A. 6666660
B. 6666600
C. 6666606
D. 6666666
E. None of these
In how many ways can eight directors, Vice-chairman and Chairman of a firm be seated at a round table, if the Chairman has to sit between the Vice-chairman and a director?
A. 9 X 2!
B. 9! X 2
C. 2×8!
D. 2×7!
A man has 9 frinds : 4 boys and 5 girls. In how many ways can he invite them, if there have to be exactly 3 girls in the invitees?
A. 320
B. 80
C. 200
D. 160
E. 140
How many numbers can be formed from 1, 2, 3, 4, 5 (without repetition), which the digit at the unit’s place must be greater than that in the ten’s place?
A. 60
B. 54
C. 2×4!
D. 51/3
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