JEE Main Mathematics question
Statement 1: The sum of the digits in the tens place of all numbers formed with the help of taken all at a time is . Statement 2: The sum of the digits in the units place of all numbers formed with the help of taken all at a time is (repetition of digits is not allowed).
Answer: (A)
Solution
Statement 2: each digit occupies the units place in of the numbers, so the units-place sum is ; it is true. Statement 1: by the same argument each of occupies the
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