Formation Of Numbers From Digits
Formation Of Numbers From Digits
Any four digit number is formed by a combination of three digits.
For example 2138 is a three digit number formed by the combination of 2, 1, 3 and 8.
Some other number that can be formed by 2, 1, 3 and 8 are
2183, 2381, 2318, 2813, 2831, 1238, 1283, 1382, 1328, 1823, 1832, and many more.
All these numbers are different
2138 = 2 thousand 1 hundred 3 tens and 8 ones.
2183 = 2 thousand 1 hundred 8 tens and 3 ones
2381 = 2 thousand 3 hundred 8 tens and 1 ones
2318 = 2 thousand 3 hundred 1 tens and 8 ones
2813 = 2 thousand 8 hundred 1 tens and 3 ones
2831 = 2 thousand 8 hundred 3 tens and 1 ones
And many more combinations can be formed
Illustration 1: The number formed by the three digit 1, 2, 4 and 7 are ____________
A..1325
B. 4247
C. 4127
D. 7312
Answer: C
Solution:
From the options available only number 4127 can be formed by the combination of digits 1, 2, 4 and 7
Hence the correct option is C
Illustration 2: The numbers 5831 can be formed by _______________ digits.
A. 1, 2, 3, 5
B. 2, 4, 5, 6
C. 8, 8, 2, 5
D. 8, 1, 5, 3
Answer: D
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