How many 3 digit numbers can be formed by using each one of the digits 2,3,5,7,9 only once
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: Show
(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:
Problem 4: How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?Solution:
Problem 5: A coin is tossed 3 times and the outcomes are recorded. How many possible outcomes are there?Solution:
Problem 6: Given 5 flags of different colours, how many different signals can be generated if each signal requires the use of 2 flags, one below the other?Solution:
8090120140 Solution : Here, we have 6 digit . How many 3∴ 3 - digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9 is 20.
How many 3This is Expert Verified Answer
6 numbers are formed. B.
How many 3∴ Required number of numbers = (1 x 5 x 4) = 20.
How many 3Hence, the required number of numbers =504.
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