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## Answers

first subtract each number with 5 .now we get the numbers 19,12,8

take two numbers.let we take 12 and 8

to find hcf

12=8×1+4

8=4×2+0

here the hcf is 4

now we will take the numbers 19 and 4

to find hcf

19=4×4+3

4=3×1+1

3=1×3+0

∴the least number is 4.