Question

find the probability of a number selected from the number 123.........20
is not a multiple of 3​

Answer 1

multiple of 3 = 3,6,9,12,15,18,

it means 6 no. s are multiple of 3

so 20-6 = 14 are not multiple of 3.

so probability

= no. of favourable outcomes / no. of possible outcomes

= 14/20

= 7/10

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