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18 Nov 2020, 04:11
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C
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Difficulty:
15%
(low)
Question Stats:
75% (00:57) correct
25%
(01:25)
wrong
based on 162
sessions
History
Date
Time
Result
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How many 3-digit numbers satisfy the following conditions: The first digit is different from zero and all digits are different from each other?
A. 504
B. 576
C. 648
D. 672
E. 810
A. 504
B. 576
C. 648
D. 672
E. 810
How many 3-digit numbers satisfy the following conditions: The first digit is different from zero and the other digits are all different from each other?
A. 504
B. 576
C. 648
D. 672
E. 810
A. 504
B. 576
C. 648
D. 672
E. 810
18 Nov 2020, 04:22
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Bunuel
There are 10 single digit numbers from 0 to 9.
The first digit can take any of the 9 digits from 1 to 9.
The 2nd digit can again take any 9 values (8 values remaining after the 1st digit is selected + 0)
The 3rd place can take any of the remaining 8 digits.
Total number of ways = 9 * 9 * 8 = 648
Option C
Arun Kumar
18 Nov 2020, 04:37
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Out of the 10 digits from 0 to 9,
the 1st digit (hundred’s place) can take any of the 9 digits from 1 to 9 (except 0)
The 2nd digit (ten’s place) can again take any 9 values (8 values remaining after the 1st digit is selected and 0)
The 3rd digit (unit’s place) can take any of the remaining 8 digits (barring the digits used at first two places)
Total number of ways = 9*9*8 = 648
Option C
Posted from my mobile device
the 1st digit (hundred’s place) can take any of the 9 digits from 1 to 9 (except 0)
The 2nd digit (ten’s place) can again take any 9 values (8 values remaining after the 1st digit is selected and 0)
The 3rd digit (unit’s place) can take any of the remaining 8 digits (barring the digits used at first two places)
Total number of ways = 9*9*8 = 648
Option C
Posted from my mobile device
