Subject :IMO Class : Class 8
Find the number of prime factors of 
A4
B7
C3
D5
the right answer for this should be 7, and not 3... could anyone explain why the answer for this is 3?
Ans 1:
Class : Class 8
The answer should be (A) 4.There are four factors, i.e. 2,3,5,7. Even the solution says so. Please correct the error.
Ans 2:
Class : Class 8
ans is 7
Ans 3:
Class : Class 4
isn't the answer "A"
Ans 4:
Class : Class 9
4
Ans 5:
Class : Class 8
Yes .... The answer is 4. ( 2, 3 ,5 and 7)
Ans 6:
Class : Class 8
The answer is 3.
When you solve the equation you get 3*3*1*1*2*14/1*1*1.
Now we see that the prime numbers left are 3,3 and 2.
Therefore there are 3 prime numbers.
Ans 7:
Class : Class 8
the answer is 7.
Ans 8:
Class : Class 8
The answer should be option (A) = 4. There are 4 prime factors, i.e. 2, 3, 5 and 7. The solution contradicts the question's answer.
Ans 9:
Class : Class 9
Ans 10:
Class : Class 8
The answer is 3.
When you solve the equation you get 3*3*1*1*2*14/1*1*1.
Now we see that the prime numbers left are 3,3 and 2.
Therefore there are 3 prime numbers.
Ans 11:
Class : Class 7
Ans 12:
Class : Class 6
the solution of the equation is 3*3*5*5*5*2*7 which has seven prime factors
Ans 13:
Class : Class 8
The answer is 4. There are 4 prime factors: 2,3,5 and 7