How many factors does 400 have?
a) 8
b) 10
c) 12
d) 15

• Ans:"15"
  400 should be factorized as prime numbers.
  So we can get, 400=(2^4)*(5^2).
  The power of prime numbers are 4 and 2.
  No of factors=(4+1)*(2+1)=5*3=15.
• 10 years agoHelpfull: Yes(55) No(0)
• 15
  2*2*2*2*5*5=400
  so we h 4 no of 2 and 2 no of 5 bt 2^0 and 5^0 is also included
  so in total we have 5*3=15
• 10 years agoHelpfull: Yes(13) No(0)
• an easier approach...!
  fact:-all perfect square numbers have odd number of factors.
  so 15 is the ans.. there is no need for prime factorization
• 10 years agoHelpfull: Yes(11) No(0)
• 15 wil b d ans
• 10 years agoHelpfull: Yes(4) No(0)
• No of factors=(4+1)*(2+1)=5*3=15.
• 9 years agoHelpfull: Yes(0) No(0)