24:50 how did you add the fractions if they had different denominators?????? Another math teacher did that, and the mark scheme also did the same. Isn't it a mistake?!
Its only one fraction 6+6/80+80+20, in case of two or more fractions to be added or subtracted you need to equalize the denominator first. Also you can check new topic video covering "straight line". ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-zKvjkXqqiwc.html
since there are 8 sweets in total and there are 3 lemon flavoured sweets, the probability of getting a lemon flavoured sweet is 3/8. which means that the probability of NOT getting a lemon flavoured sweet is 1 minus 3/8 which is 5/8. HOWEVER, the question says he picks a third sweet, which means he does this THREE times. once he picks up this lemon flavoured sweet for the first time, there are only 7 total sweets as he picked one. however there are still 3 lemon flavoured sweets left as we are taking the scenario that he is NOT choosing ANY lemon flavoured sweet. so the probability of getting lemon flavoured sweet now is 3/7, which makes the probability of not getting it 1 minus 3/7 which is 4/7. now for the third time, we apply the same logic. there are six sweets left but still only 3 lemon flavoured sweets as we need to assume he is not picking any lemon flavour sweets. therefore the probability of getting lemon sweet is 3/6 and not getting is 1 minus 3/6 which is still 3/6. since the question was asking probability of not getting lemon sweet at ALL which means he doesn't get it in the first AND second AND third scenario, we know we have to multiply the probabilities, as the probability rule states: the word AND means multiply. therefore, we multiply all probabilities. 5/8 into 4/7 into 3/6 which is 60/336 which is 5/28 if you simplify. sorry if this is long and a bit confusing, but hope this helped !
Not an issue, you can share the video among your friends, they will also get advantage of it. Also check the latest video on quadratic sequences: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vywsW4tNztg.html
Hello, about the bearings you solved it as SB but the question said from B to L so shouldn’t it have been SL because at noon ship B reached S and the question stated that from it’s position at noon to L so from S to L ?
since there are 8 sweets in total and there are 3 lemon flavoured sweets, the probability of getting a lemon flavoured sweet is 3/8. which means that the probability of NOT getting a lemon flavoured sweet is 1 minus 3/8 which is 5/8. HOWEVER, the question says he picks a third sweet, which means he does this THREE times. once he picks up this lemon flavoured sweet for the first time, there are only 7 total sweets as he picked one. however there are still 3 lemon flavoured sweets left as we are taking the scenario that he is NOT choosing ANY lemon flavoured sweet. so the probability of getting lemon flavoured sweet now is 3/7, which makes the probability of not getting it 1 minus 3/7 which is 4/7. now for the third time, we apply the same logic. there are six sweets left but still only 3 lemon flavoured sweets as we need to assume he is not picking any lemon flavour sweets. therefore the probability of getting lemon sweet is 3/6 and not getting is 1 minus 3/6 which is still 3/6. since the question was asking probability of not getting lemon sweet at ALL which means he doesn't get it in the first AND second AND third scenario, we know we have to multiply the probabilities, as the probability rule states: the word AND means multiply. therefore, we multiply all probabilities. 5/8 into 4/7 into 3/6 which is 60/336 which is 5/28 if you simplify. sorry if this is long and a bit confusing, but hope this helped !
