1)the no. of square on a chess board is-
options:a)64,b)160,c)224,d)204
2)the total no. of seven digit nos. the sum of whose digits is even is-
options:a)9000000,b)4500000,c)8100000,d)none of these
3)the no. of different word groups formed by taking at least one letter from the letters of the words 'RANDOM','NOBLE,and 'INTEGRAL' are-
a)248031,b)255,c)230975,d)498015
4)20 persons were invited for a party.in how many ways can they nd the host be seated at a circin an ular table?in how many of these ways will two particular persons be seated on either side of the host?
5)find the number of ways in wch 10 candidates A1,A2,A3,.....A10 can be ranked a)if A1 and A2 are next to each other,and
b)A1 is just above A2
C)if A1is always above A2
6)in an examination,the maximum marks for each of the three papers are 50 each.maximum marks for the fourth paper are 100.find the no. of ways in wch the candidate can score 60% marks in aggregate.
answers:
1)D
2)B
3)D
4)20!,2(18)!
5)a)2.9!, b)9!, c)10!/2
6)110551
explain wid pics........
