What is the next number of the following sequences

1) 1, 3, 3, 2, 8, 10, 3, 4, 12, 4, 8, ? (Is it 21?)

2) 9, 12, 4, 8, 12, 15, 5, 9, 3, 6, 2, 6, 6, 9, ? (Is it 3?)

3) 15 3/4, 16, 26, 9 1/5, 9, 19, 64 2/3, 65, 75, 30 3/8, ? (Is it 30?)

4) 3/2, 2 1/4, 9/4, 7/2, 12 1/4, 49/4, 4/3, 1 1/7, 16/9, ?

5) 2,6,5,14,11,26,17,?

6) 7776,625,64,9,?

• questn 2 and 3 are correct.
  for the 1st questn my logic is :
  1, 3, 3// 2, 8, 10// 3, 4, 12// 4, 8, ?
  3*1=3/////2+8=10/////3*4=12/////4+8=12
  therefore ? =12(ans)[a series with * and + alternate operatn]. xplain how u got 21
• 11 years agoHelpfull: Yes(21) No(0)
• 6) 7776,625,64,9,?
  
  take the reverse sequence ?,9,64,625,7776
  
  9 --> 3^2
  64--> 4^3
  625--> 5^4
  7776--> 6^5
  so ? is 2^1=2
• 11 years agoHelpfull: Yes(15) No(1)
• 2,6,5,14,11,26,17,?ans:38
  (2,next prime no is 3 so 3*2=6)
  (5,next prime no is 7 so 7*2=14)
  (11,next prime no is 13 so 13*2=26)
  (17,next prime no is 19 so 19*2=38)
• 11 years agoHelpfull: Yes(7) No(1)
• logic for 5th q.is divide the series in pairs and then,
  (2,6)(5,14)(11,26)(17, _) so in blank it will be 17+22=39
  +4 +9 +15 +22
  +5 +6 +7
• 11 years agoHelpfull: Yes(6) No(4)
• [1,3,3,2],[8,10,3,4],[12,4,8,a]
  1+3+3+2=9=3*3
  8+10+3+4=25=5*5
  12+4+8+a=7*7...ie a=25 !!
• 11 years agoHelpfull: Yes(3) No(1)
• 1)1+3+3+2=9=3^2
  8+10+3+4=25=5^2
  12+4+8+x=49=7^2
  x=49-24
  =25(ans)
• 11 years agoHelpfull: Yes(1) No(0)
• 1)12 (alt grp of 3-3rd no. multiple or sum of 1st 2 no.s)
  2)6 (5x3 matrix-colmn sumation 34)
  6)2
• 11 years agoHelpfull: Yes(0) No(0)
• 5)ans:42
  take even series 6,14,26,?
  the difference between them is 8,12,16
  so,ans:42
• 8 years agoHelpfull: Yes(0) No(0)