Question

Hello guys
How many terms of the AP -6, -11/2 , -5 ...... are needed to give the sum -25 ? Explain the double answer.
Friends u have to explain only double answer and please give step by step explanation

Answer 1

Answer:

Step-by-step explanation:

Jis step mein meine star lagaya hai uss step mein

If you put the value of x=20 inside the bracket toh bahar toh as it is 20 hoga and inside the bracket -5 ho jayega

That will give -100

Similarly,

If we put the value of x=5 inside the bracket toh bahar toh as it is 5 hoga and inside the bracket -20 ho jayega

That will again give -100

Therefore,

Both

X=5 and

X=20

Are correct