What is the Kaprekar constant for 4 digit numbers ?, 495, 6174, 1089, 9999, Who is the Indian mathematician who discovered this 4-digit constant in 1949?, Shakuntala Devi, D.R.Kaprekar, Aryabhata, S.Ramanujan, Which of the following 4 digit number will not reach 6174 using the Kaprekar routine ?, 3333, 9876, 8953, 0987

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