Equation involving two variables and Permutation
I am going to share you a simple tricks which I remembered and it helped me a lot.So let's start.
1st Topic:Equation involving two variables
→ 1st Tip
| For Example → Find the value of x and y if x+y=7 and x2-xy+y2=13??? |
| Option ↓ a).(1,0) b).(2,1) c).(4,3) d).(-3,2) |
| How → This question can be solved within 30 second but How?? |
| Solution → This question is solved very easily because in entry test options are given in question sheet.Simply you have to satisfy 1 option which satisfy the equation. |
| Answer → So,Option c will satisfy the equation if you put x=4 and y=3 you will satisfy the equation.But if you put (-3,2) in given equation,given equation will not satisfy the condition |
Sometimes questions asked like this → How many roots of given equation.
| Simply the degree of equation is equal to the roots of equation. |
2nd Topic:Permutation
→ 1st Tip
| For Example → How many arrangements of the letters of the "Pakistan" words,taken all together,can be made ? |
| Tips → Count the letters.i.e.8 and count how many words are same.In above example,2 A is same whereas remaining alphabet only 1.So we divide total count alphabet/same alphabet. |
| Solution → So we get 8!/2!. |
| Answer → 20160 is correct answer ♥ |
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