00:01
In this question, we are given that aditya is celebrating his birthday.
00:06
He invited his friends and bought a bucket of toffies or candies, which contains 120 candies.
00:16
He arranges the 120 candies in such that in the first row there are three candies.
00:25
So first row, three candies, second row, five candies, third row.
00:35
Seven candies and so on.
00:39
So in the first part of the question we'll be finding the total number of rows of candy.
00:46
So remember the first row has five, three, the second one has five, the next one has seven.
00:54
So that means we are skipping three, we are sorry, we are adding two additional candies to move to the next row.
01:05
All right and the sum should be 120 so you want to get the total number of rules so let's do the addition 3 plus 5 plus 7 plus so the next number should be 9 now if you take your calculator and just type 3 plus 5 plus 7 plus 9 you're going to get 24 so that means you can continue to the next number which is 11 you add 11 you're going to get 35 so continue add that in at 13 you're going to get 48, so move on.
01:44
Add 15, you get 63, so you continue, add 17, and you're going to get 80.
01:55
Move on, add 19, you're going to get 99, move on and add 21, and you're going to get 120.
02:09
So how many rows are these? so we can count them.
02:15
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 rows.
02:21
So the correct answer is 10.
02:26
Next, we're going to tell how many candies are placed in the last row.
02:33
And as you can see, we had the last row having 21...