Question

Two decks of card are there each deck conatins 51 cards with numbers from 1 to 51 log of x+log y is positive integer

Answer 1

log x+log y=log(xy)

log (base 10)(xy) is integer when xy is 10^n,where n=1,2,3....so on

1. 10^1=10, 5*2--- 2 combinations or 10*1----2 combinations-------total 4 combinations

2. 10^2=100, 5*20---2 combinations or 10*10----1 combination-----total 3 combinations

all total 7 combinations are integers

total no of combinations possible=20*20

probabilility=7/(20*20)=7/400

Answer 2

what is the meaning of decks