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akhil009

  • 3 years ago

what is the unit digit of product.....

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  1. akhil009
    • 3 years ago
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    |dw:1344435549985:dw|

  2. telltoamit
    • 3 years ago
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    second digit is 25?

  3. akhil009
    • 3 years ago
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    2nd component is 251

  4. akhil009
    • 3 years ago
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    \[3547^{153}*251^{72}\]

  5. telltoamit
    • 3 years ago
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    first digit: unit value changes like 7,9,3,1,7... first digit: unit value remains 1

  6. akhil009
    • 3 years ago
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    can you pls elaborate it

  7. telltoamit
    • 3 years ago
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    7 into 7 = 49; 9 into 7 = 63; 3 into 7 = 21; 1 into 7 = 7

  8. akhil009
    • 3 years ago
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    but ques is for 153 times also product of 251^72

  9. telltoamit
    • 3 years ago
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    so after every 4 times it repeats. as 152 is a multiple of 4, the reptition will happen till there on the 156rd multiplication , we ll get 7 again so 7 into 1 = 7 == ANSWER

  10. telltoamit
    • 3 years ago
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    gtg bye

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