Bunuel wrote:
How many of the integers between 1 and 400, inclusive, are not divisible by 4 and do not contain any 4s as a digit?
A. 72
B. 251
C. 252
D. 323
E. 324
Since their are total 400 numbers..100 will be divided by 4 hence our answer will be less than 300 option D and E are out
now numbers which have digit 4 but not divisible by 4
14, 34, 41, 42, 43, 45, 46, 47, 49, 54, 74, 94 = 12 nos.
Since last two digits are not divisible by 4 we can safely put one more digit in the next numbers
114, 134, 141, 142, 143, 146, 147, 149, 154, 174, 194
214, 234, 241, 242, 243, 246, 247, 249, 254, 274, 294
314, 334, 341, 342, 343, 346, 347, 349, 354, 374, 394
300 - 48 = 252 nos.
Option C
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