how many telephone numbers consist of 6 digits

how many telephone numbers consist of 6 digits, the first two in the range 2-5 , the third in the range 1-9 and the last three in the range 0-9 ?
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1 Answer

For the first two digits there are 16 (4*4); there are 9 for the third digit and 1000 (10^3) for the last three. In total then we have 16*9*1000=144,000.
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