A four digit number is to be formed using the digits 1 to 7
All digits of the number are different and repetition is not
allowed.
1. How many such numbers can be formed ?
2. How many such numbers are divisible by 4 ?
- 11 Answers
- 35313 Views
- Infosys, MMI, Naval Academy, SMN, TCS, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / sumati
Answer 1:
At unit's place 7 possibilities r dere.
At ten's place 6,
At hundred's place 5,
At thousand's place 4.
Therefore, 7*6*5*4=840
Answer 2:
for any number to b divisible by 4, the last two digit must
b divisible by 4. Such 2 digit combinations possible are.....
12,16,24,32,36,52,56,64,72,76.
At last two places, any one combination out of these 10 is
possible. For first two digits in the 4 digit number, the
possible combinations are 5*4=20
So there r 20*10=200 numbers divisible by 4.
| Is This Answer Correct ? | 71 Yes | 7 No |
Answer / purvi
Ans-200
I see with 1..7 if last 2 digits are
12,16,24,32,36,52,56,64,72,76...then the no. is divisible by 4
means last 2 digits has possible 10 Combinations
So Answer=P(5,2)*10=20*10=200
its correct!!!!!!!!!!!!!
| Is This Answer Correct ? | 16 Yes | 4 No |
Answer / satyam4friends
the total numbers are formed are 7.6.5.4=840
the numbers that are divided by 4 are= 7.6.5.3=630
| Is This Answer Correct ? | 45 Yes | 38 No |
Answer / hh
I see with 1..7 if last 2 digits are
12,16,24,32,36,52,56,64,72,76...then the no. is divisible by 4
means last 2 digits has possible 10 Combinations
So Answer=P(5,2)*10=20*10=200
its correct!!!!!!!!!!!!!
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / iii
Answer 1:
At unit's place 7 possibilities r dere.
At ten's place 6,
At hundred's place 5,
At thousand's place 4.
Therefore, 7*6*5*4=840
Answer 2:
for any number to b divisible by 4, the last two digit must
b divisible by 4. Such 2 digit combinations possible are.....
12,16,24,32,36,52,56,64,72,76.
There are total 7 nos
out of which a 4 digit no is to be formed.
7 nos can be arranged in 7! and 4 digit no. can be formed
in 4*7! ways
At last two places, any one combination out of these 10 is
possible. For first two digits in the 4 digit number, the
possible combinations are 5*4=20
So there r 20*10=200 numbers divisible by 4.
| Is This Answer Correct ? | 2 Yes | 0 No |
In a well of 20feet depth, a frog jumps 5feet up in the morning and comes 4feet down in the evening, on which day the frog gets out of the well.
1.Fresh Grapes contain 90% water by wt. Dried grapes contain 20% water by %age. What will b wt of dried grapes when we begin with 20 kg fresh grapes? a)2kg b) 2.4kg c) 2.5kg d) none Answer. C 2.How many 5 digit no. can b formed wit digits 1, 2, 3,4,5,6 which r divisible by 4 and digits not repeated a)144 b)168 c)192 d) none Answer. C 3.There is a rectangular Garden whose length and width are 60m X 20m.There is a walkway of uniform width around garden. Area of walkway is 516m^2. Find width of walkway a)1 b)2 c)3 d)4 Answer. C 4.If 1= (3/4)(1+ (y/x) ) then i. x=3y ii. x=y/3 iii. x=(2/3)y iv. none Answer. A 5. The sum of six consecutive odd nos. is 888. What is the average of the nos.? i. 147 ii. 148 iii. 149 iv. 146 Answer. B 6. if x-y + z = 19 , y + z =20 , x-z=3 , find d value of x+4y-5z a)22 b)38 c)17 d) none 7. Find approx value of 39.987/0.8102+1.987*18.02 a)72 b)56 c)86 d)44 Answer. C 8. Asish was given Rs. 158 in denominations of Rs 1 each. He distributes these in diff bags, such that ne sum of money of denomination betn 1 and 158 can be given in bags. The min no. of such bags reqd a)10 b)17 c)15 d) none Answer. D
I am first every thing. I end of all trouble. I Alway come in time. I alway end a dialogue. I alway in u r Dream.
Next number in the series 1, 1/2, 1/4, 1/8 ?
0 Answers BPCL Bharat Petroleum, Sonata,
The value of x is between 0 & 1 which is the larger? A) x B) x^2 C) -x D) 1/x
slur : speech : : smudge :?
how do to prepare the sbi exam
0 Answers State Bank Of India SBI,
If LOAD = MPBE and DRIVE = ESJWF Then LADDLER = ?
A son and father go for boating in river upstream. After rowing for 1 mile son notices the hat of his father falling in the river. After 5 min. he tells his father that his hat has fallen. So they turn around and are able to pick the hat at the point from where they began boating after 5 min. tell the speed of river.
A triangle has sides of lengths 10, 24 and k. k is a positive integer. The number of values of k for which this triangle has three acute angles is
For a user to be able to choose an option from a dropdown list, what would you set as they allow settings in the data validation settings tab in excel? a) list B) rigion c) Option d) range
Two computers each produced 48000 public utility bills in a day. One computer printed bills at the rate of 9600 an hour and the other at the rate of 7800 an hour. When the first computer finished its run, how many bills did the other computer still have to print?
English 
