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 ?
Answer Posted / 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 |
Post New Answer View All Answers
A person travels 12 km in the southward direction and then travels 5km to the right and then travels 15km toward the right and finally travels 5km towards the east, how far is he from his starting place?
A 16 stored building has 12000 sq.feet on each floor. Company A rents floors and company B rents 4 floors. What is the number of sq.feet of unrented floor space.
need Thomson Reuters Questions and Answers
Solve for x and y: 1/x - 1/y = 1/3, 1/x2 + 1/y2 = 5/9.
If a car starts from A towards B with some velocity due to some problem in the engine after travelling 30km.If the car goes with 4/5 th of its actual velocity the car reaches B 45min later to the actual time. If the car engine fails after travelling 45km, the car reaches the destination B 36min late to the actual time , what is the initial velocity of car and what is the distance between A and B in km
If 15 pens costs Rs.90..then what will be the cost of 22pens?
194 base 10 = ____ base 5
Ms. Neelam deposits an amount of Rs. 16420 at simple interest and obtained 25451 at the end of 5 years. What was the rate of interest per year?
How would you measure 4 liters using jugs of 3l and 5l? Give a few solutions to this problem?
X < 0, Y <> 0 then what is the possibility that the result is always positive?
In the series 0, 3, 8, 15,__ What is the next number?
In a class of 60 students, a student of weight 45 Kg leaves the class. The average weight of the class is then increased by 200 gms. What is the average weight of the remaining 59 students in the class?
ABCE is an isosceles trapezoid and ACDE is a rectangle. AB = 10 and EC = 20. What is the length of AE?
A speedboat whose speed is 15 kmph in still water goes 30 kmph downstream and comes back in a total of 4hrs 30min. What is the speed of the stream in kmph?
hi...i have got selected for United bank po interview.can anyboby suggest me how to prepare for interview.r there any books for po interview?i am asking because..this s my 1 st bank interview...pls send me interview material if u have any ..my mail id=pruthi_tarun@yahoo.co.in....thank u