28. How many numbers lie between 300 and
500 in which 4 comes only one time?
Tx
99
(2) 100
110
(4) 120
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No.s from 300 to 399:
304, 314, 324, 334, 340, ..., 343, 345, ..., 349... = 18 No.s
No.s from 400 to 499 no.s with single 4 are:
100 – 18 = 82
Total No.s = 18 + 82 = 100
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