divisiblilty

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How many integers are divisible by 3 between 10! and 10!+20 inclusive?



6

[moutar]

There are 21 numbers between 10! and 10! + 20.

Every third number is divisible by 3.

Therefore there are 21/3 = 7 numbers divisible by 3 in the range.

[PAB2706]

how come there are 21 integers btwn 10! + 20 and 10!..

I thot there were 20 and thus i got answer as 6

[mals24]

The question says 10! and 10!+20 inclusive

The formula for number of integers between A and B inclusive = A - B + 1

Number of integers between 10! and 10!+20 inclusive
= 10! + 20 - 10! + 1
= 21 integers.