Math, asked by theRockstar8880, 13 days ago

How many four digits numbers can be formed using 0,1,3,5,7,9 if repitation is not alowed


Answered by siddhant728


36 four digit can be formed without any repitation . because if u observe this no. kinely then u can able to understand the pattern

Answered by Anonymous

✍︎......︎︎︎ᴥ︎︎︎︎︎︎ Aɴsᴡᴇʀ࿐

Total no. of digits are 5, i.e., n=5

Total no. of digits required is 4, i.e.,

r = 4


No. of 4 digits no. that can be formed =nPr=5P4=1!5!=120

No. of times each digit will appear =5120=24

Sum of digits at unit place =24(1+3+5+7+9)=24×25=600

Sum of all numbers =600×1000+600×100+600×10+600=666600

Hence the sum off all 4 diit numbers is 666600.

P.S: As 0 has no Value so I didn't mention it.

H O P E I T H E L P S !!!




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