Question

Find the unit's digit in the product of the first 30 odd natural numbers​

Answer 1

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Answer 2

As the first 30 odd numbers contains 5. So the product is a multiple of 5.

Multiple of 5 can contain 5 or 0 in the units digit. But only odd numbers are multiplied so there is no chance of 0 in units digit.

So the product's unit digit is 5.