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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 4
ans is 7

Ans 2:

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 3:

Class : Class 9
4

Ans 4:

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 5:

Class : Class 8
The answer is 4. There are 4 prime factors: 2,3,5 and 7

Ans 6:

Class : Class 9
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 7:

Class : Class 8
Yes .... The answer is 4. ( 2, 3 ,5 and 7)

Ans 8:

Class : Class 9
ans is 4. (2,3,5,7)

Ans 9:

Class : Class 4
isn't the answer "A"

Ans 10:

Class : Class 8
the answer is 7.

Ans 11:

Class : Class 6
the solution of the equation is 3*3*5*5*5*2*7 which has seven prime factors

Ans 12:

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 13:

Class : Class 8
the answer is 4!!!

Ans 14:

Class : Class 8
The answer is 4, not 3

Ans 15:

Class : Class 7

Ans 16:

Class : Class 9

Ans 17:

Class : Class 8

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