Question

How many numbers lie between 300 and 500 in which 4 comes only one time?​

Answer 1

First of all find the numbers between 300 and 500 where 4 comes only one time.

In between 300 to 399 the numbers are 304,314,334,340,341,342,343,345,346,347,348,349,354,364,374,384,394.

Here, 17 numbers are there.

Now move on to the numbers between 400 and 500.

There are 100 numbers from 400 to 499. Here we are to exclude the numbers like 404, 414,434,440–449, 454,464,474,484,494=18 numbers. All the other numbers can be included as they have only one 4.

So the number of numbers between 400–499 which has only one 4 is=100–18=82.

So total number of numbers which have only one 4 between 300–500 is=17+82=99.

Answer 2

Answer:

304,314,324,334,340,341,342,343,345,346,347,

348,349,354,364,374,384,394,400,401,402,403,

404,405,406,407,408,409,410,411,412,413,415,416,417,418,419,420,421,422,423,425,426,427,428,

429,430,431,432,433,435,436,437,438,439,450,

451,452,453,455,456,457,458,459,460,461,462,

463,465,466,467,468,469,470,471,472,473,475,

476,477,478,479,480,481,482,483,485,486,487,488,489,490,491,492,493,495,496,497,498,499,

100 no's

hope it helps