How many numbers can be formed from the digits 1 2 9 if repetition of digits is not allowed?
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question says that how many numbers can be formed from the digit 1 2 3 and 9 if repetition of digits is not allowed so the digits given to us is 123 and night superstar ful the maximum number which can be formed from this four digits is 9321 this can be the maximum number can be found from this four digit number we cannot form greatest number that this number with this 4 digit numbers so let us see first the 4 digit numbers that can be formed from this number so 4 digit number which can be formed from this digits are there for places and repetition is not allowed so for Show
place we have four options to fill this place that is either one can come to can come 3 can come on come addition of digit is not allowed if we have placed a digit hair soap for this please only three digits are left similarly for this two students are left and for the last digit only one digit is left so it is and what are the fundamental principle of multiplication will be multiplied so that is 4 into 3 into 2 into 1 is 24 ways are there so it is 2444 digit numbers can be formed from this four digits now that is 3 how many 3 digit numbers can be formed from the digits Shri places and in the first place therefore option to fill this first place and similarly there are three options for failed to fill this place and there are two option to fill this place that is also 24 number so there are 24 numbers of 3 digits can be possible from these four digits given to us that AC two digit number now Chhotu digits number so there are two places in two digit number for this place four options are available and for this place there are three options are available so it is 12 numbers so well numbers of two digits can be possible with this four digits and one digit number will be the only one possible way that is 4 and which can be either 123 online this phone number one digit is possible it is phone numbers so total numbers that is possible with given four digits are 24 + 24 + 12 + 4 that is equal to 25 + 2448 4850 1664 number 7 64 numbers are possible with the given 1 2 3 and 9 digits everybody son of digit is not allowed How many numbers can be formed from digits 1 2 3 9 if repetition of digits is not allowed?Hence, 64 numbers can be formed.
How many 4digit numbers can be formed by using the digits 1 to 9 if repetition is not allowed?=9×8×7×6=3024.
How many two digit numbers can be made from the digits 1 to 9 if repetition is allowed?81 possible two digit numbers.
How many four digit numbers are there if repetition of digits is not allowed?Hence, total number of four digit numbers, without repetitions, which are divisible by 5 are 504+448=952.
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