If you count from 1to100,how many 7's will you pass on the way?A.10B.11C.19D.20E.21

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If you count from 1to100,how many 7's will you pass on the way?A.10B.11C.19D.20E.21

If you count from 1to100,how many 7's will you pass on the way?A.10B.11C.19D.20E.21
If you count from 1to100,how many 7's will you pass on the way?
A.10
B.11
C.19
D.20
E.21

If you count from 1to100,how many 7's will you pass on the way?A.10B.11C.19D.20E.21
20个..我数过了...

从70 到79 共用了10个7, 另外 7 到67是7个, 80到100当中还有2个,共19个