Question 865896: A 4-digit number is formed using the following cards,1,2,4,5,7,8,9.
Find the number of ways of forming a 4-digit odd number which is less than 7000
Answer by dkppathak(439)   (Show Source):
You can put this solution on YOUR website! A 4-digit number is formed using the following cards,1,2,4,5,7,8,9.
Find the number of ways of forming a 4-digit odd number which is less than 7000
4 digit number have thousand place hundred place tens place unit place
for odd number we can have option for unit place = 4 (1,5,7,9)
for tens place options are = 7 (1,2,4,5,7,8,9 any one )
For hundred place we can have options =7 (1,2,4,5,7,8,9,)
for thousands place we can have options , as we need to have 4 digit less than 7000 = 4(1,2,4,5)
Total 4 digit number can formed below 7000 will be = options for thousands placex options for hundreds place x options for tens place x options for unit place
total 4 digit number with repetitions and with out repetition = 4x7x7x4= 784 numbers
Answer 4 dits odd number will be 784
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