exam Maths Puzzle Numerical Ability

PL. help with this question realted to sets.
Let A,B & C be sets such that A U B = A U C and A I B = A I C

Show that B = C

(symbols : U - Union , I - Intersectio

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exam Other Question

A number between 300 and 400. If it is divided by 2, the remainder is 1. If it is divided by 4,6, or 8, the remainder is 3. If it is devied by 10, the remainder is 5. If t divided by 3,5,7, or 9, the remainder is zero. What is the number? Graph f(x)=x+2-5 Give the vertex of this V-graph

~+ means absolute value!!