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How many of the integers between 1 and 400, inclusive, are not

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How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 25 Jul 2017, 01:47
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How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 12 Sep 2019, 06:03
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Bunuel wrote:
How many of the integers between 1 and 400, inclusive, are not divisible by 4 and do not contain any 4s as a digit?

A. 72
B. 251
C. 252
D. 323
E. 324


This is a great question.
There are a total of 400 numbers.
The numbers divisible by 4 are 100. so we remove these 100 numbers.

Now we need to remove the numbers that contain the digit 4.
400 is already removed as it is divisible by 4.
Now, we need to remove numbers of the type
x4y
so the numbers 41,42,43,45,46,47 and 49. 44 and 48 are already removed as they are divisible by 4.
there are a total of 7 numbers in 1-100 and a total of 28 numbers in 1-400.

now we need to numbers of the type xy4 and the numbers are 14,34,54,74 and 94. as 24,44,64,84 are already removed because they are divisible by 4.
there are a total of 5 numbers of this type in 1-100 and a total of 20 numbers in 1-400.

The total numbers that need to be removed are 100+28+20 = 148

Remaining numbers = 400 - 148 = 252.

OA - C
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 25 Jul 2017, 02:05
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Bunuel wrote:
How many of the integers between 1 and 400, inclusive, are not divisible by 4 and do not contain any 4s as a digit?

A. 72
B. 251
C. 252
D. 323
E. 324


Since their are total 400 numbers..100 will be divided by 4 hence our answer will be less than 300 option D and E are out
now numbers which have digit 4 but not divisible by 4
14, 34, 41, 42, 43, 45, 46, 47, 49, 54, 74, 94 = 12 nos.
Since last two digits are not divisible by 4 we can safely put one more digit in the next numbers
114, 134, 141, 142, 143, 146, 147, 149, 154, 174, 194
214, 234, 241, 242, 243, 246, 247, 249, 254, 274, 294
314, 334, 341, 342, 343, 346, 347, 349, 354, 374, 394

300 - 48 = 252 nos.
Option C
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How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 25 Jul 2017, 02:47
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Out of the total 400 integers that exist between 1 and 400,
there are 300 integers which are not divisible by 4,
Since we are asked how many integers do not contain a 4 as a digit as well.
We have numbers 14, 34, 41, 42, 43, 45, 46, 47, 49, 54, 74, 94 in the range 1-100
which aren't divisible by 4.

Similarly, we have these integers in the ranges 100-200,200-300 and 300-400.
So there are a total of 48 integers which have a 4 but aren't divisible by 4.
So, total of such integers is 300 - 48 = 252 (Option C)
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 25 Jan 2019, 23:43
Bunuel wrote:
How many of the integers between 1 and 400, inclusive, are not divisible by 4 and do not contain any 4s as a digit?

A. 72
B. 251
C. 252
D. 323
E. 324


Between 1 and 400, We have 100 multiples of 4

We can eliminate D and E, as the total numbers become 300.

Now lets look for a pattern in 1 - 100 range
1-10 0
10-20 1
30-40 1
40-50 7
50-60 1
60-70 0
70-80 1
80-90 0
90-100 1

Number of times 4 will be in that range => 12

Total will be 12*4 = 48

300-48 = 252

C
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 26 Jan 2019, 01:27
Integers between 1 and 400 inclusive: 400

Integers Divisible by 4: (400-4)/4 + 1 = 100

Integers with Digit 4 in hundreds place: 1 (400)
Integers with Digit 4 in tens place: 40 (4 x 1 x 10: digits for hundred 0,1,2,3 / for tens 4 / for unit 0-9)
Integers with Digit 4 in units place: 36 (4 x 9 x 1: digits for hundred 0,1,2,3 / for tens 0-9 except 4 / for unit 4)

Total: 100+1+40+36 = 177

Correction for double count in 177 integers: 29
Between 0-99: 7 Integers (4,24,40,48,64,84)
Similarly, 7 Integers each between 100-199, 200-299, 300-399.
Finally, 1 integer 400

Integers not divisible by 4 and do not contain 4: 400-(177-29) = 252.
Ans C
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 26 Jan 2019, 23:38
Shobhit7 wrote:
Integers between 1 and 400 inclusive: 400

Integers Divisible by 4: (400-4)/4 + 1 = 100

Integers with Digit 4 in hundreds place: 1 (400)
Integers with Digit 4 in tens place: 40 (4 x 1 x 10: digits for hundred 0,1,2,3 / for tens 4 / for unit 0-9)
Integers with Digit 4 in units place: 36 (4 x 9 x 1: digits for hundred 0,1,2,3 / for tens 0-9 except 4 / for unit 4)

Total: 100+1+40+36 = 177

Correction for double count in 177 integers: 29
Between 0-99: 7 Integers (4,24,40,48,64,84)
Similarly, 7 Integers each between 100-199, 200-299, 300-399.
Finally, 1 integer 400

Integers not divisible by 4 and do not contain 4: 400-(177-29) = 252.
Ans C



Can we solve this question by using factorial? Then subtract numbers that have 4s with 400?
400/4 + 400/16 + 400/64 + 400/256
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 12 Sep 2019, 02:32
Bunuel ,

Why don't we count 80, 84, 88 etc.?
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 12 Sep 2019, 02:40
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 12 Sep 2019, 02:44
Bunuel ,

Thanks. I should be more careful
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Re: How many of the integers between 1 and 400, inclusive, are not  [#permalink]

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New post 12 Sep 2019, 02:56
Bunuel wrote:
How many of the integers between 1 and 400, inclusive, are not divisible by 4 and do not contain any 4s as a digit?

A. 72
B. 251
C. 252
D. 323
E. 324


total digits 400
and integers divisible by 4 from 1 to 400 ; 100 so left with 300 digits which are not divisible by 4
now digits which do not contain 4 and are not divisible by 4 ; 14, 34, 41, 42, 43, 45, 46, 47, 49, 54, 74, 94 we will have same no with hundereds as 1,2,3 so total 12*4 ; 48
answer 300-48 ; 252
IMO C
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Re: How many of the integers between 1 and 400, inclusive, are not   [#permalink] 12 Sep 2019, 02:56
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