Number between 1 to 301. Find the non prime numbers is not divisible by 2,3,5,7.

• The answer is=5+4+1=10
  
  non prime no. which are not divisible by 2,3,5,7 can not be divisible by 4,6,8,9 also.
  
  So only the Product of prime no.s which are less than 301 will be the answer.
  
  so range of prime no.s are (11,13,17,19,23)
  11*(any of the 5 prime No.)
• 9 years agoHelpfull: Yes(3) No(0)
• (11,13,17,19,23)
  (23*11)=253 noprime
  (23*13)=299 noprime
  (19*11)=209 noprime
  (19*13)=247 noprime
  (17*11)=187 noprime
  (17*13)=221 noprime
  (17*17)=289 noprime
  (11*13)=143 noprime
  (13*13)=169 noprime
  (11*11)=121noprime
  ans 10
  
• 9 years agoHelpfull: Yes(3) No(0)
• My approach:
  
  Multiplication of prime with itself or other primes gives composite numbers. So
  
  11*11=121
  
  11*13=143
  
  11*17=187
  
  11*19=209
  
  11*23=253
  
  11*29=319 which is not in range of 1-301 so we cant conider it
  
  13*13=169
  
  13*17=221
  
  13*19=247
  
  13*23=299
  
  17*17=289
  
  17*19=323 which is not in range of 1-301 so we can't consider it..so 10 would be my answer .
• 9 years agoHelpfull: Yes(2) No(1)
• 299
  non prime can be divided by only 13
• 9 years agoHelpfull: Yes(1) No(1)
• non prime no. which are not divisible by 2,3,5,7 can not be divisible by 4,6,8,9 also.
  
  So only the Product of prime no.s which are less than 301 will be the answer.
  
  so range of prime no.s are (11,13,17,19,23)
  11*(any of the 5 prime No.)
• 9 years agoHelpfull: Yes(0) No(1)
• 121,143,299 are some of the numbers
• 9 years agoHelpfull: Yes(0) No(1)
• answer is 79
  refer solved example 1.33 of ARUN SHARMA QUANT of chapter number systems..
  
• 9 years agoHelpfull: Yes(0) No(1)
• Answer will be 69.
• 9 years agoHelpfull: Yes(0) No(0)
• (11,13,17,19,23) = 5C3 =10
• 9 years agoHelpfull: Yes(0) No(0)
• 7
  11*13,11*17,11*19,11*23
  13*17,13*19,13*23
• 9 years agoHelpfull: Yes(0) No(0)