Question

find the sum of 9 + 99 + 999 + 9999
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Answer 1

Answer:

9+99+999+9999

11,106

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

HEY MATE YOUR ANSWER IS HERE ^_^

9 can be written as 10 - 1

99 can be written as 100 - 1

...................

Therefore,

9+99+999+9999=(10-1)+(100-1)+(1000-1)+(10000-1)

10+100+1000+10000 - 4 = 10(10^4-1)/(10-1) - 4 =10×9999/9 - 4 = 10×1111 - 4 = 11110 - 4 = 11106

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