how many numbers are possible between 100 to 999 where middle digit is smaller than other two. e.g. 102?
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0
answer:-
285
explaination:-
10_ =9
2__ =9+8
3__=9+8+7
4__=9+8+7+6
;
;
;
9__=9+8+7+6+5+4+3+2+1
them sum all
these=9+17+24+30+35+39+42+44+45=285
ans=285
285
explaination:-
10_ =9
2__ =9+8
3__=9+8+7
4__=9+8+7+6
;
;
;
9__=9+8+7+6+5+4+3+2+1
them sum all
these=9+17+24+30+35+39+42+44+45=285
ans=285
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