Q8-------------------Hpw many numbers b/w 200 and 1200 can be formed with digits 0,1,2,3(repetations not allowed).
a. 6
b. 6
c. 2
d. 14
How many numbers can be formed if repetition is allowed.
a. 48
b. 63
c. 32
d. 14
2007-07-10 12:34:21 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
a-
201
203
210
213
230
231
301
302
310
312
320
321
1023
1032
How many is that?
b-
201
202
203
210
211
212
213
220
221
222
223
230
231
232
233
300
301
302
303
310
311
312
313
320
321
322
323
330
331
332
333
1000
1001
1002
1003
1010
1011
1012
1013
1020
1021
1022
1023
1030
1031
1032
1033
1100
1101
1102
1103
1110
1111
1112
1113
1120
1121
1122
1123
1130
1131
1132
1133
How many is that?
2007-07-10 13:06:42 · answer #1 · answered by Gary H 6 · 0⤊ 0⤋
first question, d: 201, 203, 210, 213, 230, 231, 301, 302, 310, 312, 320, 321, 1023, 1032
second question: 200, 201, 202, 203, 210, 211, 212, 213, 220, 221, 222, 223, 230, 231, 232, 233, 300 and 15 others like the 200-series but starting with 3, 1000, 1001, 1002, 1003, 1010, 1011, 1012, 1013, 1020, 1021, 1022, 1023, 1030, 1031, 1032, 1033, 1100 and 15 others like the 1000-series but starting with 11.
That makes 64 so presumably "between" is not inclusive, so exclude 200= 63.
2007-07-10 12:47:12 · answer #2 · answered by Goddess of Grammar 7 · 1⤊ 0⤋
d and a
2007-07-10 12:44:05 · answer #3 · answered by Abhimanyu 2 · 0⤊ 1⤋