How many numbers between 200 and 1200 can be formed with the digits 0, 1, 2, 3 (repetition of digits not allowed) ?
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it can be ... 201,,, 203,,,, 213,,, 231,, 230 ,,, 301, 302. ,,, 310,,, 312,,,,, 320,,, 321,,,, and many more......
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