Find 7
Number Theory
Level
3
Very Simple Question: Solve this within 01 minute.
From 1 to 100, how many 7 are there?
20
10
19
18
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Total nos of 7 (from 1 to 69),
= 7, 17, 27, 37, 47, 57, 67 = 07 nos
Total nos of 7 (from 70 to 79),
= 70, 71,72 ,73, 74, 75, 76, 77, 78, 79 = 11 nos (77 has 02 nos of 7)
Total nos of 7 (from 80 to 100),
= 87, 97 = 02 nos
So, Total nos of 7 from 1 to 100 = 07 + 11 + 02 = 20