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The integers from 1 to 1618 are entered sequentially in 13 columns (numbered 1 to 13); i.e. Row 1 contains the numbers 1 to 13, Row 2 contains the next 13 numbers and so on. If the number 561 occurs in row p and column q, then the value of p + q is

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TCS Other Question

The units digit of the sum of the first 84 positive integers (that is 1 + 2 + 3 + ... + 84 ) is How many integers x satisfy the equation

(x^2 - 6x + 10)x^2 + x = 1