Question

How many numbers between 1 and 200 are exactly divisible by exactly two of 3, 9 and 27?​

Answer 1

Answer:

Step-by-step explanation:

15 numers between 1 to 200 can be divisble by 3,9 and 27

Answer 2

Answer:

15

Step-by-step explanation:

Anything divisible by 27 will be div by 3 and 9 also...

Anything divisible by 9 is also divisible by 3,

SO we look for multiple of 9 till 200, but these should not be divisible by 27..

Multiples of 9 till 200 = 200/9=22.xy, so 22 multiples

Multiples of 27 till 200= 200/27=7.xy, so 7 multiples

Therefore answer = 22-7=15

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