300 to 500 ke bich kitni aisi sankhya hai jinme 4 Keval ek bar aaya Ho
Answers
Given : Numbers between 300 and 500
To Find : How many Numbers having 4 as only once.
Solution:
300 to 500
Break into two groups:
1st 301 to 399
2nd 400 to 499
304 , 314 ,324 , 334 , 354 , 364 , 374 , 384 , 394 = 9
340 , 341 , 342 , 343 , 345 , 346 , 347 , 348 , 349 = 9
9+9 = 18 numbers with one 4
400 to 499 = 100 Numbers with one or more 4
404 , 414 ,424 , 434 , 454 , 464 , 474 , 484 , 494 = 9
440 , 441 , 442 , 443 , 445 , 446 , 447 , 448 , 449 = 9
18 number with 2 four
444 = 1 , 1 number with 1 four
9+9+1 = 19 number has more than one 4
Total Numbers = 18 + 100 - 19
= 99
99 Numbers having 4 as only once.
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