In T. Nagar the building were numbered from 1 to 100.Then how many 4‟s will be present in the numbers?
Option
a) 18
b) 19
c) 20
d) 21

• Ans. 20
  Explanation:4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
• 10 years agoHelpfull: Yes(31) No(8)
• 19
  1-10=1
  10-20=1
  20-30=1
  30-40=1
  40-50=10
  50-60=1
  60-70=1
  70-80=1
  80-90=1
  90-100=1
• 10 years agoHelpfull: Yes(8) No(16)
• 0-10=1 four
  11-20=1
  21-30=1
  31-40=2
  41-50=10
  51-60=1
  61-70=1
  71-80=1
  81-90=1
  91-100=1
  total=20
• 10 years agoHelpfull: Yes(4) No(3)
• Ans - c) 20
  numbers- 1,10,11,12,13,14,15,16,17,18,19,21,
  31,41,51,61,71,81,91,100
• 10 years agoHelpfull: Yes(2) No(1)
• 4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
  ans 20
  
• 10 years agoHelpfull: Yes(2) No(0)
• 19
  4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
• 10 years agoHelpfull: Yes(2) No(0)
• its 19
  Explanation:4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
• 10 years agoHelpfull: Yes(1) No(0)
• ans : 19.
  
• 9 years agoHelpfull: Yes(1) No(0)
• we need to count the no of 4's between 1 to 100...
  1-10=1
  11-20=1
  21-30=1
  31-40=2
  41-50=10
  51-60=1
  61-70=1
  71-80=1
  81-90=1
  91-100=1
  total=23
  but none of the optins match....
• 10 years agoHelpfull: Yes(0) No(1)
• c)20 count the number from 1 to 100
• 10 years agoHelpfull: Yes(0) No(0)
• 20,because 4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
• 10 years agoHelpfull: Yes(0) No(0)
• 04,14,24,34,44,54,....94 =number of 4 =10.
  and
  4049 = number of fours are 10
  
  Total =20
• 10 years agoHelpfull: Yes(0) No(0)
• if we count the no. of 4's serial wise i.e.,4,14,24,34,40-49(remember 44 has two 4's),54,64,74,84,94 then we get twenty 4s.therefore ans is 20
• 10 years agoHelpfull: Yes(0) No(0)
• Ans is 20
  4
  14
  24
  34
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  54
  64
  74
  84
  94
• 10 years agoHelpfull: Yes(0) No(1)
• 31
  100/4=25
  25/4=6
  25+6= 31
• 10 years agoHelpfull: Yes(0) No(0)
• ans. so simple 20
• 10 years agoHelpfull: Yes(0) No(0)
• Its 20
  4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
  Dont forget 40 and also that 44 has 2 4's
  1-10=1 (4)
  11-20=1 (14)
  21-30=1 (24)
  31-40=2 (34 and 40)
  41-50=10 (41,42,43,44,45,46,47,48,49)
  51-60=1 (54)
  61-70=1 (64)
  71-80=1 (74)
  81-90=1 (84)
  91-100=1 (94)
• 10 years agoHelpfull: Yes(0) No(0)
• Ans. 20
  Explanation:4,14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94
  44 has 2 4's
• 10 years agoHelpfull: Yes(0) No(0)
• B)19. 4,14,24,34,41-49,54,64,74,84,94=19 4's
• 10 years agoHelpfull: Yes(0) No(0)
• 20 is the answer
• 10 years agoHelpfull: Yes(0) No(0)
• 1-10 : 1 (4)
  11-20 : 1 (14)
  21-30 : 1 (24)
  31-40 : 2 (34,40)
  41-50 : 10 (41,42,43,44,45,46,47,48,49) there are 2 fours in 44
  51-60 : 1 (54)
  61-70 : 1 (64)
  71-80 : 1 (74)
  81-90 : 1 (84)
  91-100: 1 (94)
  total = 20 fours between 1 to 100
  ans: C
• 10 years agoHelpfull: Yes(0) No(0)
• 19
  as 4,14,24,34,44,54,64,74,84,94and nine numbers from 40 t0 49 9 nos excluding 44
• 9 years agoHelpfull: Yes(0) No(1)
• =int(1/2)+int(1/2+0.01)+int(1/2+0.02)+..........+int(1/2+0.99)
  it is in A.P i.e.,let int(1/2)=1,int(1/2+0.01)=1 similarly assume all bcoz int(x)
• 9 years agoHelpfull: Yes(0) No(0)
• The ans is 20
  4,14,24,.......
• 7 years agoHelpfull: Yes(0) No(0)
• 19
  4 is 10 in 100 and 9 in 41.........49=19
• 7 years agoHelpfull: Yes(0) No(0)