Find the next number in the series 1, 3 ,7 ,13 ,21 ,31

(a) 43
(b) 33
(c) 41
(d) 45

• 3-1=2
  7-3=4
  13-7=6
  21-13=8
  31-21=10
  so tyhe next number is 31+12=43 is the answer
• 12 years agoHelpfull: Yes(18) No(2)
• answer is 43.
  we get the answer by adding even numbers to the series.
  series is 1,3,7,13,21,31
  1+2=3
  3+4=7
  7+6=13
  13+8=21
  21+10=31
  & 31+12=43.
  so ans is 43.(option-a)
  
• 12 years agoHelpfull: Yes(7) No(0)
• the sequence have multiples of 2.
  ans=43
• 10 years agoHelpfull: Yes(3) No(0)
• 43
  because
  1
  1+2=3
  3+4=7
  7+6=13
  13+8=21
  21+10=31
  31+12=43
• 10 years agoHelpfull: Yes(2) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(1) No(1)
• 1+(2)=3
  3+(4)=7
  7+(6)=13
  13+(8)=21
  21+(10)=31
  31+(12)=43
• 12 years agoHelpfull: Yes(1) No(0)
• 1+(2)=3
  3+(4)=7
  7+(6)=13
  13+(8)=21
  21+(10)=31
  31+(12)=43
• 9 years agoHelpfull: Yes(1) No(0)
• answer is 43 option a)
  the difference between the consecutive two numbers is 2,4,6,8,10,12
  so 31+12=43.
• 9 years agoHelpfull: Yes(1) No(0)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• The difference b/w the given series is 2 multiples.
  2.4,6,8,10.
  the next is 12
  so 43-31=12
  the answer is 43
• 12 years agoHelpfull: Yes(0) No(1)
• 43. its digit square n the subtracting the result by increasing natural number
• 12 years agoHelpfull: Yes(0) No(0)
• 43 is the answer
• 5 years agoHelpfull: Yes(0) No(0)
• Answer is (a)43
  Difference between 2 nos is the addition of even nos i.e.,
  1+2 =3
  3+4=7
  7+6=13
  13+8=21
  21+10=31
  31+12=43
• 5 years agoHelpfull: Yes(0) No(0)