digit sum

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  • #8532
    faruuq
    Participant
    • Topics: 1
    • Replies: 0

    3986+2789=6775 digit sum=7

    however 6874 also got the same digit sum as the correct answer even though it is wrong

    can someone explain please?

    Thanks

    #8533
    Abhishek R
    Keymaster
    • Topics: 0
    • Replies: 46

    Hey Faruuq,

    Digit sum can only verify your answer with 90% accuracy.

    If you want a higher level of accuracy you can use the DS method in conjunction with the DD method. However even that is not 100%.

    The only way to be 100% sure your answer is correct, is to do the calculation again.

    Hope this clarifies.

    #10754
    Areadien
    Participant
    • Topics: 4
    • Replies: 7

    6874 has the same digit sum as 6775 because 6874 = 6874 – 99. In fact, they have the same digit difference because the difference is a multiple of 11.

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