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Posted by **Mildred** on Monday, October 19, 2009 at 11:20pm.

a) 10 and 400

b) 10 and 1000

Thanks

- Maths -
**Mark**, Monday, October 19, 2009 at 11:25pmwhat is a?

- Maths -
**Mildred**, Monday, October 19, 2009 at 11:30pmSorry,

a) 10 and 400

b) 10 and 1000

- Maths -
**Mark**, Monday, October 19, 2009 at 11:39pmim not sure im typing as i find them.

A=total of counting the numbers 11,22,33,44,55,66,77,88,99,101,202,303

B) = total counting the numbers

11,22,33,44,55,66,77,88,99,101,202,303,404,505,606,707,808,909

- Maths -
**jim**, Tuesday, October 20, 2009 at 8:21amMark is right, but for numbers of the form x0x, you can of course use any digit, not just zero, so

101

also implies

111, 121, 131,....

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