Latest IBM Aptitude Question SOLUTION: How many 5\'s are there in the number 121122123...till 356

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(#M40033890) IBM Numerical Ability question 5's in the sequence Keep an EYE

How many 5's are there in the number 121122123...till 356

Asked In IBM santhoshi (10 years ago)

Unsolved Read Solution (8)

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RAKESH  (10 years ago)

121122123... till 356
121,122,123,124... till 356

121 to 200 => 125,135,145, from 150 to 159 => 11 5's , 165,175,185,195
[from 150 to 159, each no. has 1 no. of 5 except 155, 155 has 2 no. of 5]
total=18

201 to 300 => 205,215,225,235,245, 250 to 259 => 11 5's , 265,275,285,295
=> total=20

301 to 356 => 305,315,325,335,345,350,351,352,353,354,355(2 5's),356
=> total=13

total no. of 5's = 18 + 20 + 13 = 51

Is this solution Helpfull? Yes (42) | No   

Ghanshyam Gulati  (10 years ago)

the no. includes 5 from 121 to 200 are (125,135,145,150 to 159,165,175,185,195)
no. of 5's are = 18 (because 155 has two 5's)

from 201 to 300 (205,215,225,235,245,250 to 259,265,275,285,295)
no of 5's are =20

from 301 to 356 (305,315,325,335,345,350 to 356)
no. of 5's are 13

hence ans is 18+20+13=51

Is this solution Helpfull? Yes (2) | No   

maya gadagkar  (10 years ago)

its in the form of 121 122 123 124 and so on...
so simply calculate the number of 5's
125,135,145,150,155,165,175,185,195,205,215,225,235,245,250,255,265,275,285,295,305,315,325,335,345,350,355..
so altogeter there are 30 5's

Is this solution Helpfull? Yes (1) | No (5)  

satyanarayana  (10 years ago)

Answer is :51

Is this solution Helpfull? Yes (1) | No (1)  

AMIT KUMAR  (10 years ago)

48 times
given series is 121 122 123 124.....356
121 to 200 7+11=18(125,135,145,65,175,185,195)+(150,151,152,153,154,155,156,157,158,159)
201 to 300 9+11=20
301 to 356 5+8=13
total 5=51ans.

Is this solution Helpfull? Yes (1) | No (1)  

shaik hussian  (10 years ago)

my ans is 30

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yanna vaishnavi  (10 years ago)

Yes its 51 only

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Hari Sankhar  (10 years ago)

(8+1)+(10+1)+(5+1)=26

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