Decide which elements should be put in region 3 given The information below. U={b, c,f, h, k, n: r,t,\ .w:x,y} A={b: c. i, h, l: v} E!={h: k. n, r, t, v} List all of The elements That should be placed in region 3. {'3 (Use a comma to separate answers as needed.) LT Suyin has 135 pennies and 225 nickels. She wants to place them all in stacks so that each stack has the same number of coins, and each stack contains only one denomination of coin. IWhat is the greatest number of coins that she can place in each stack? The greatest number of coins in each stack is D. (Simplify your answer. Type an integer.} \f