Question

how many 3's you have to write down while writing the numbers from 3301 to 3401

Answer 1

3300to 3400
100 + 1x99
and 1 to 99
10 + 10 + 1
= 199 + 21
=220 times

Answer 2

Given: 3's from 3301 to 3401.

From 1 to 100 no of 3's are,

20

3301 to 3399 no of 3's are,

$2\times 99+20=198+20\\=218$

3301 to 3401 no of 3's are,

$218+2=220$

220 number of 3's are in 3301 to 3401.

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