There are four boxes A1,A2,A−3 and A4. Box Ai has i cards and on each card, a number is printed. The numbers are from 1 to i. A box is selected randomly, the probability of selection of box Ai is i10 then a card is drawn. Let Ei represent the event that a card with number 'i' is drawn. Now answer the following :If P(E1) is ab, then (H.C.F. of a and b is 1)

There are four boxes A1,A2,A−3 and A4. Box Ai has i cards and on eac

1.	There are four boxes A1,A2,A−3 and A4. Box Ai has i cards and on each card, a number is printed. The numbers are from 1 to i. A box is selected randomly, the probability of selection of box Ai is i10 then a card is drawn. Let Ei represent the event that a card with number 'i' is drawn. Now answer the following :If P(E1) is ab, then (H.C.F. of a and b is 1)
Answer» There are four boxes $A_{1}, A_{2}, A - 3 and A_{4}$ . Box $A_{i}$ has $i$ cards and on each card, a number is printed. The numbers are from $1 to i$ . A box is selected randomly, the probability of selection of box $A_{i} is \frac{i}{10}$ then a card is drawn. Let $E_{i}$ represent the event that a card with number 'i' is drawn. Now answer the following : If $P (E_{1})$ is $\frac{a}{b}$ , then (H.C.F. of a and b is 1)