Exercise1:Find all pairs of positive integers (x;y) satisfy the equation:

1!+2!+3!+.......x!=y²

CÁC BẠN GIẢI HỘ MÌNH BẰNG TIẾNG ANH NHÉ

Find all pairs of positive integers (x;y) satisfy the equation: 1!+2!+3!+.......x!=y²

Excercise1:Find all pairs of positive integers(x, y) satisfy the equation

1!+2!+3!+...+x!=y²

^{CÁC BẠN GIẢI HỘ MÌNH BẰNG TIẾNG ANH NHÉ}

Number 6 is written as sum of two positive integers in three different ways: $6=1+5=2+4=3+3.$ (order does NOT matter). That is, there are exactly three different pairs of positive integers that add to make six. How many pairs of positive integers that add to make 1000?

Number 6 is written as sum of two positive integers in three different ways: $6=1+5=2+4=3+3.$ (order does NOT matter). That is, there are exactly three different pairs of positive integers that add to make six. How many pairs of positive integers that add to make 1000?

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the sum A of 191 consecutive positive integers is a perfect square . Find the largest of those 191 positive integers so that A has the smallest value  

The mean, median, and unique mode of the positive integers 3,4,5,6,7 and x are all equal. What is the value of x ?

Find the sum of three positive integers such that the sum of their reciprocal is 2.

The sum of 2 positive integers a;b ends with 5.Find the last digit of the number a x b x (a + b).Dịch dùm mik nha!