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  1. The digit in unit’s place of the product 81 × 82 × 83 × ... × 89 is
    1. 0
    2. 2
    3. 6
    4. 8
Correct Option: A

The digit in unit’s place = unit’s digit in the product 1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 × 9
See the 5 and 8 from given unit place of product will multiply and give 0 at unit place and then other unit place number will multiply with 0 and final number will be 0 at unit place.



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