hi all,
pls assist :
If y is a prime number greater than 5 and x = 10y, how many different positive even divisors does x have, including x ?
Ans choices :
2
3
4
5
6
For me the answer is 3, but the original answer seems to be 4 how?
My solution :
A) prime number greater than 5 is : 7,11,13, 17
B) there fore y = 7,11,13,17 etc
Given : x = 10y
x = 10* 7 = 70
x=10*11= 110
x=10*13 = 130
even divisors for 70 are : 2,10,14,70 (odd divisors : 1,7,5,35)
even divisors for 130 are : 2,10,130 (odd divisors : 1,13,5)
is the question incorrect ? or have i missed any even divisor of 130?
pls assist :
If y is a prime number greater than 5 and x = 10y, how many different positive even divisors does x have, including x ?
Ans choices :
2
3
4
5
6
For me the answer is 3, but the original answer seems to be 4 how?
My solution :
A) prime number greater than 5 is : 7,11,13, 17
B) there fore y = 7,11,13,17 etc
Given : x = 10y
x = 10* 7 = 70
x=10*11= 110
x=10*13 = 130
even divisors for 70 are : 2,10,14,70 (odd divisors : 1,7,5,35)
even divisors for 130 are : 2,10,130 (odd divisors : 1,13,5)
is the question incorrect ? or have i missed any even divisor of 130?
