Question

find the probab of given sum​

Answer 1

answer : 5/34

explanation : Cards numbered 7 to 40 were put in a box.

so, total number of cards in the box = 40 - 7 + 1= 34

[ because we have to include card numbered 7 so, we add 1 ]

so, sample space, n(S) = total number of cards

we have to find probability of a card which is a multiple of 7.

so, selected cards are ; 7, 14, 21, 28, 35.

hence, favourable outcomes, n(E) = 5

we know,

probability = favourable outcomes/sample space

or, P(E) = n(E)/n(S) = 5/34

hence, probability of a card which is multiple of 7 = 5/34

Answer 2

cards are numbered 7 to 40

so total cards are

40-7 + 1 = 34

multiple of 7 are 5

7 , 14 ,21 , 28 , 35 ,


numbers of favorable = 5

total number = 34

probability of finding multiple of 7 = 5/34