A probability of spinning a number that can be divided by three is 3/10. Predict in 40 spins how many times you would spin a number divisible by 3?

Iknow one of the answers is a and maybe b but not 100% sure about b

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)