Take a number 'x' and follow these steps :
1. Find the sum of its digit
2. If the sum has only one digit , STOP
3. Else , go back to step 1 with the new number.
If x = 1684 ,what is the end result ?

1. 19 2. 10 3. 1
4. None of these

• 1+6+8+4=19
  sum=19 two digits
  so go to step 1
  1+9=10 two digits
  so go to step 1
  1+0=1
  ANSWER IS 3)1
• 11 years agoHelpfull: Yes(14) No(0)
• end result is 1.
  sum of digits of 1684 = 19
  sum of digits of 19=10
  sum of digits of 10 =1
• 12 years agoHelpfull: Yes(4) No(0)
• ans=3(1);
  x=1689 i.e sum of all digit=19
  and ans has been two digit no.
  so add 1+9=10
  again same goto same step1
  add 1+0=1;
  ans 3(1);
  
  
• 11 years agoHelpfull: Yes(1) No(0)
• ans 1
  
  explanation:
  sum of digits =19
  it is two digit no
  again sum of digits =10
  again, it is two digit no
  now , sum of digits=1
  ans is 1 QED :)
• 11 years agoHelpfull: Yes(0) No(0)
• number is 1684.
  sum of digits=1+6+8+4=19 is a two digit number
  sum of digits in 19=1+9=10 is a two digit number
  sum of digits in 10=1+0=1 so STOP
  answer is 1.
• 10 years agoHelpfull: Yes(0) No(0)
• 1+6+8+4=19
  like 10
  1
• 9 years agoHelpfull: Yes(0) No(0)
• step1 - sum of digits 1+6+8+4 = 19
  step 2 - its doesnt have one digit
  step 3 - (step 1 ) add the sum of digits 1+9 = 10
  again step 2 not a unit digit
  step 3 - go to step 1 add the digits 1+0 = 1
  therefore the result is 1.
• 7 years agoHelpfull: Yes(0) No(0)
• 1+6+8+4=19
  1+9=10
  1+0=1
  stop
• 5 years agoHelpfull: Yes(0) No(0)
• 10
  as 1+6+8+4=19--- 1+9=10----1+0=1
• 5 years agoHelpfull: Yes(0) No(0)