How many even three digit numbers can be formed from the digits 1, 2, 5, 6 and 9
A discount series of 10%, 20% and 40% is equal to a single discount of (a) 50.0% (b) 56.8% (c) 60.2% (d) 70.28% Show
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that is case one case one when we have at ones place we will have the choices that is to 4 and 6 not zero right so the ones place canfield in three ways slide and hear the given is no digit is repeated that mean once the number is selected here the remaining choices we have for the other digit that is we have 7 Number So here this thousand place can be filled with five ways right because 0 want fill send if 0 will come here then it won't be a four digit number it will be a three digit number right to the remaining 7 from the seven we once we fix a number we will have 6 choices the main and from the 62 This ones will be the zero so we will neglect s0 and we fixed we will get 5 number 5 number we can place at this place of the remaining here 0 will be also counted so here we will have five possible digit can be filled in display and here we have three number will be formed that is 5 into 5 into 4 into three that is equal to 300 right now case to case to that is that is 1234 right here we fix zero right so here we fix it is 1 number only two former even number right now the choices we have for this place will be 6 right here we will have 5 and here we will have 4 choices so this will come 6 into 5 into 4 into one that is equal to 120 night so we will add both cases the number we will get that is 0 24 25 number of even number we will get with this digit is 420 thank you Problem 1: How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that –(i) repetition of the digits is allowed?Solution:
(ii) repetition of the digits is not allowed?Solution:
Problem 2: How many 3-digit even numbers can be formed from the digits 1, 2, 3, 4, 5, 6 if the digits can be repeated?Solution:
Problem 3: How many 4-letter code can be formed using the first 10 letters of the English alphabet if no letter can be repeated?Solution:
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