Book
Maths Puzzle
Numerical Ability
Permutation and Combination
How many 4 digit can be written using 1,2,3,4,5,6, and 8 only once such that 2 is contained once its answer is 4C1*7C3*3! how????
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Book Other Question
Proud that 0=1 (without use factorial)
find the last two digits of the following expression with explaination :-
(1021)^3921 + (3081)^3921