How many positive integers less than 500 can be formed using the numbers 1,2,3 and 5.Each digits being used only once?
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Answered by
1
Step-by-step explanation:
i may not be able to give explaination
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12
Answer:34 is the correct answer
Step-by-step explanation:
Well if you see,
1 and 2 digits number formed by 1,2,3 and 5 is always gonna be less than 500..
no. of 1 digit numbers using 1,2,3 and 5 will be =4
(below C stands for combination)
no. of 2 digit number using 1,2,3 and 5 will be = (4 C 1) *( 3 C 1)= 12
no. of 3 digit number using 1,2,3 and 5 (without 5 being at place of hundred)
= (3 C 1) *( 3 C 1) *(2 C 1) = 18
total numbers formed which are less than 500 is = 18+12+4=34 ways
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