Question

How many number
number greater than 9
but less than 1000 have each
digit exceeding the digit
to its left?​

Answer 1

Answer:

I think so five

Step-by-step explanation:

I hope so it will be uelpfull

Answer 2

Given : number greater than 9  but less than 1000

To Find : How many number have each digit exceeding the digit

to its left?​

Solution:

Two digit

12  - 19  

23 - 29

34 - 39

78 - 79

89

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8  = 36

Three Digit

starting  with 1

23 - 29

34 - 39

78 - 79

89

1 + 2 + 3 + 4 + 5 + 6 + 7 = 28

starting  with 2

34 - 39

78 - 79

89

1 + 2 + 3 + 4 + 5 + 6 =  21

and so on

36 + 28 + 21 +  15 + 10 + 6 +  3 + 1

= 120

There are 120  number greater than 9 but less than 1000 have each

digit exceeding the digit to its left

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