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    Question

    If each of the odd digits in the number ' 78343724' is

    decreased by 1 and each of the even digits is increased by 1, which of the following will be the sum of the digits of so formed number?
    A 27 Correct Answer Incorrect Answer
    B 34 Correct Answer Incorrect Answer
    C 42 Correct Answer Incorrect Answer
    D 38 Correct Answer Incorrect Answer

    Solution

    New number formed after adding and subtracting is 69252635 6+9+2+5+2+6+3+5 = 38 Alternate Method:- There are 4 odd and 4 even digits so finally addition and subtraction will be same. Hence, the sum of digits will remain same. 7+8+3+4+3+7+2+4 = 38

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