How to identify permutation and combination?
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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
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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