1.

How to identify permutation and combination?

Answer» PERMUTATION is for arranging the THINGS whereas combination for selection.

selecting TWO nos. shall be 10C2

making nos. from two digit (including 0 at unit PLACE, just ASSUMING for sake of understanding),
ans shall be selecting two nos.*arranging these two nos. + nos. formed by same nos.(11,22,33...total 10)
10C2*2P2+10


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