Question 459211: HOW MANY FOUR DIGIT NUMBERS CAN BE FORMED FROM 1,2,3,4,5,6,7 WHICH IS GREATER THAN 3400?
Answer by sudhanshu_kmr(1152)   (Show Source):
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No. of 4 digit numbers where first digit is 4,5,6 or 7.
4* 6P3 = 4 * 120 = 480
No. of 4 digit numbers where first digit is 3..
second place can be filled by 4,5,6,or 7.
no. of possible numbers = 4*5P2 = 4 * 20 = 80
total no. of possible numbers formed from 1,2,3,4,5,6 and 7
and greater than 3400 = 480 + 80 = 560
Note- repetition is not allowed here.
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