exam Maths Puzzle Numerical Ability

Perform the indicated operation

11-6/7-7 (This is a fraction.)

Would this one also be undefined??

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exam Other Question

1.How i find smallest positive number in the A.P 500,493,486,479......
2.How I find the smallest number of terms of A.P -54,-52.5,-51,-49.5..which musr be taken for the sum of the terms to be positive. Find all of the zeros of the polynomial 3x^3+ x^2-3x-1.