Question

 If A # B = A + (A − B)2 and C & D = 3 × (C + D), then
The value of (1 # 2) & 3​

Answer 1

Answer is 6

(1#2)&3 = 1+(1-2)2 & 3 = -1 & 3 = 3×(-1+3) = 3×2 = 6