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How many numbers of six digits can be formed from the digits 1, 2, 3, 4, 5, 6 (no digit being repeated)? How many of these are not divisible by 5?
Read Solution (Total 2)
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- 6 digit without repeatation =6!=720
divisible by 5 end with 5 so 5!=120
720-120=600 not divisible by 5
- 9 years agoHelpfull: Yes(0) No(0)
- 1) Number of Six digit forms = 6! = 720
2) The Numbers are divisible by 5 = 5! =120
Then the number is not divisible by 5 = 720 - 120 =600 - 9 years agoHelpfull: Yes(0) No(0)
UPSC Other Question
How many numbers greater than 4000 can be formed using the digits 2, 3, 4, 5, 6 when no digit is repeated?
Read the Following passage and answer the three questions that follow:
A, B, C, D, E are members of the same family. There are two fathers, two sons, two wives, three males and two females. The teacher was the wife of a lawyer who was the son of a doctor. E is not a male, neither also a wife of a professional. C is the youngest person in the family and D is the oldest.
Q1.How is D related to E?
(A) Husband
(B) Son
(C) Father
(D) Wife
(E) None of these
Q2.Who are the females in the group?
(A) C and E
(B) C and D
(C) E and A
(D) D and E
(E) A and B
Q3.Whose wife is the teacher?
(A) C
(B) D
(C) A
(D) B
(E) None of these