how many 4 digit numbers have same digit in the hundreds place tens place and ones place
Answers
Answer:
81 four digit numbers
Step-by-step explanation:
1111
1222
1333
1444
1555
1666
1777
1888
1999
2111
2222
2333
2444
2555
2666
2777
2888
2999
3111
3222
3333
3444
3555
3666
3777
3888
3999
4111
4222
4333
4444
4555
4666
4777
4888
4999
5111
5222
5333
5444
5555
5666
5777
5888
5999
6111
6222
6333
6444
6555
6666
6777
6888
6999
7111
7222
7333
7444
7555
7666
7777
7888
7999
8111
8222
8333
8444
8555
8666
8777
8888
8999
9111
9222
9333
9444
9555
9666
9777
9888
9999
Answer:
90 numbers.
Step-by-step explanation:
All four digit numbers are between 1000-9999
we will calculate numbers having same digit in hundreds, tens and ones -
1000
1111
1222
1333
1444
1555
1666
1777
1888
1999
1)So there are 10 numbers in between 1000-1999
similarely ,
2)from 2000-2999 will have 10 numbers
3)from 3000-3999 will have 10 numbers
4)from 4000-4999 will have 10 numbers
5)from 5000-5999 will have 10 numbers
6)from 6000-6999 will have 10 numbers
7)from 7000- 7999 will have 10 numbers
8)from 8000-8999 will have 10 numbers
9)from 9000-9999 will have 10 numbers
So in adding all the 10 numbers fron 1) to 9)
Total 90 numbers have the same digit in hundred, ten and ones place