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`        How many 5 digit munber can be made by using 1,2,3,4,5,6,7,8 in the number are greater  4321 if repetation js not allowed`
one year ago

Arun
22987 Points
```							Case 1- If 1st digit from left is greater than 4HenceTotal numbers = 4 *7*6*5*4 = 1680 Case 2- First digit from left is 4Then option for second digit , this also makes 2 option as It is 3 then also for third digit there are 2 options as it will be 2 or greater than 2.Hence total numbers in 2nd case= 1* 1*1*4 + 1* 1* 4* 5 + 1* 4* 6*5 = 4 + 20 + 120 = 144 Hence total numbers = 1680 + 144 = 1828 RegardsArun (askIITians forum expert)
```
one year ago
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