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  4. The unit's digit in the product of 20 odd natural number is

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Q. The unit's digit in the product of 20 odd natural number is

Real Numbers

Solution:

Product of 20 odd natural no. $=1.3 .5 \ldots 39$
When any natural number is multiplied by 5 , then unit digit will be 5
Hence, the unit digit of 20 odd natural number $=5$