A number AABB is the square of an integer. Find this integer, aided by pen and paper. No other calculating aids allowed.

(In reply to

Solution by Strahinja)

".........a0+a2+a4+...+a2i=a1+a3+a5+a(2i+1) " - ????

NOT SO..THE SUMS MIGHT DIFFER BY A MULTIPLE OF 11.

Thus we get A+B=11 and the number is 7744, i.e. 88 squared

ady