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Arjun Adate from Pawar Public School , Pune
Subject :IMO    Class : Class 3

How many four digit numbers can be formed, using 7, 5, 0, 2 only once in a number?

A 4
B 12
C 9
D 18


Do we have formulae to solve this problem?

Ans 1:

Tanishka from Gopalan International School, Bangalore
Class : Class 1
its so easy right

Ans 2:

Soumyajit Das from Hariyana Vidya Mandir, NORTH 24 PARGANAS
Class : Class 6
option d

Ans 3:

Suyash Maurya from Chandresh Lodha Memorial School, Dombivali
Class : Class 3

Ans 4:

Shaurya Tandon from Amity International, Noida
Class : Class 3

Ans 5:

Varesh Hemwani from R.D Public School Betul, betul
Class : Class 3
(D) 18

Ans 6:

arjun from NISV, Vadodara
Class : Class 3
lol

Ans 7:

Ishika Kumar from Greenwood High, Bangalore
Class : Class 4

Ans 8:

ARYAN P from DPS E-CITY Bangalore, Bangalore
Class : Class 5

Ans 9:

Rudra Veer Singh from Delhi Public School Noida, Noida
Class : Class 4
TOUGH FOR CLASS 1

Ans 10:

Kashika Goel from DPS Noida, Noida
Class : Class 6

Ans 11:

Vibhuraman from NPS, Bangalore
Class : Class 3
n!-(n-1)! is the answer. n is number of digits here. (n-1)! is subtracted from n! since there is digit with 0. otherwise it is just n! Now How do you calculate n!. For example 4! here. 4! = 4x3x2x1 = 24 (4-1)! = 3! = 3x2x1 = 6 Hence the answer is n! - (n-1)! = 4! - (4-1)! = 4! - 3! = 24 -6 = 18 Option D is the answer.

Ans 12:

Shaurya Tandon from Amity International, Noida
Class : Class 3
lol class 1 ha ha ha..

Ans 13:

JIYA GOSWAMI from DPS, Ranchi
Class : Class 5
Using Factorial for Class 3 seems difficult. I taught my daughter as under:- Step 1 - Put 7 at thousand place and how many different numbers we can get --She replied 6 Step 2- Put 5 at thousand place and how many different numbers we can get --She replied 6 Step 3 -Put 0 at thousand place , do we get four digit number --She replied NO Ste 4 - Put 2 at thousand place and how many different numbers we can get --She replied 6 Step 5 - Add numbers obtained in above steps we get 18

Ans 14:

Ishika Kumar from Greenwood High, Bangalore
Class : Class 4

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