What is the first number in the series ? 19 23 29 31
a)20
b)16
c)18
d)15
e)17

• the first number in the series ? 19 23 29 31
  
  because this is series of prime numbers starting with 17.
  
  so option e)17
• 13 years agoHelpfull: Yes(4) No(0)
• 17
  as 17 is prime number before 19.
• 13 years agoHelpfull: Yes(1) No(2)