What is the next number of the following sequence

1) 3 15 35 3 ?

2) 2 4 12 48 ?

3) 10 7 12 10 14 ?

• 1) Wrong Question... The Question is 3, 15, 35, 63, x
  2^2 - 1 = 3
  4^2 - 1 = 15
  6^2 - 1 = 35
  8^2 - 1 = 63
  10^2 - 1 = 99
  Ans : 99
  
  2) 2, 4, 12, 48, x
  2 * 2 = 4
  4 * 3 = 12
  12 * 4 = 48
  48 * 5 = 240
  Ans : 240
  
  3) 10, 7, 12 , 10, 14, x
  10 - 3 = 7... 7 + 5 = 12
  12 - 2 = 10.. 10 + 4 = 14
  14 - 1 = 13
  Ans : 13
• 10 years agoHelpfull: Yes(42) No(1)
• 1.(15-3)=12,(35-15)=20,(35-3)=32
  and 20-12=8,32-20=12 i.e it is 4*2 and 4*3 then 4*4=16 so 16+32=48so 48-3=45
  ans=51
  
• 10 years agoHelpfull: Yes(3) No(2)
• all earlier submission is crap :P
  
  a n b finish in 28 days so work is equal to 28a + 28b
  
  now in next statement a ,b and c finish in 21 days so now work is 21a + 21b + 21c.
  
  as both u can see tht : 21c = 7a + 7b hence c finishes 1/4 work in 21 days
  
  so required day will b : 4*21 = 84 :)
• 9 years agoHelpfull: Yes(1) No(2)
• 2) 2, 4, 12, 48, x
  2 * 2 = 4
  4 * 3 = 12
  12 * 4 = 48
  48 * 5 = 240
  Ans : 240
  
  3) 10, 7, 12 , 10, 14, x
  10 - 3 = 7... 7 + 5 = 12
  12 - 2 = 10.. 10 + 4 = 14
  14 - 1 = 13
  Ans : 13
• 10 years agoHelpfull: Yes(0) No(0)
• 2)2*1=2
  2*2=4
  4*3=12
  12*4=48
  48*5=240
  ans:-240
  3)10----12----14,difference2
  7-----10----13,difference3
  ans:-13
• 9 years agoHelpfull: Yes(0) No(0)