Yearly Archives: 2022

Topic Assume that in the first year, Ms. Hanh deposits in bank A (VND) with interest rate r%/year. At the end of the first year, Ms. Hanh did not withdraw…

Topic By induction, prove: a) \({n^5} – n\) is divisible by 5 \(\forall n \in \mathbb{N}*\) b) \({n^7} – n\) divisible by 7 \(\forall n \in \mathbb{N}*\) Solution method –…

Topic A person deposits amount A (VND) in a bank. The bank's interest rate schedule is as follows: Divide each year into m terms and interest rate r%/year. Know that…

Topic A group of 10 students participated in the Green Summer campaign. The school wants to select a task force with at least two of these students. How many ways…

Topic Uncle Thanh wanted to buy a gift for his son on the occasion of his birthday, so he went to a toy store. I plan to choose 1 out…

Topic Assume status in a tree species is determined by the cumulative effect of n pairs of alleles that independently segregate \({A_1}{a_1},A{ & _2}{a_2},…,{A_n}{a_n} \). Let \({F_1}\) tree heterozygous for…

To participate in a baking contest, Tien makes 12 cakes of different colors and chooses an even positive number of cakes to put in a display box. Ask Tien how…

Topic Given the set \(A = \left\{ {{x_1};{x_2};{x_3};…;{x_n}} \right\}\) has n elements. Calculate the number of subsets of A Solution method – See details The number of subsets of a…