Question

‌can you please give me the answer for the following correctly, I will mark you brainliest, if the answer is correct.

I asked this question and got the following answer:
are coal mines of the Chottanagpur plateau an example of stock??​
No, the damodar valley of chhotanagpur plateau is rich in coal and it is considered as the prime centre of coking coal in the country

Consider the following statements:

Assertion (A) Reserves are the subset of the stock, which can be put into use with the help of existing technical 'know-how' but their use has not been started.

Reason (R) Coil mines of Chota Nagpur Plateau are the good example of Stock.

* Find out the correct answer from the code:-

1. Both A and R are true and R is the correct explanation of A

2. Both A and R are true but Ris not the correct explanation ofA

3. A is true but R is false

4. A is false and R is true​​
​

Answer 1

Step 1: First of all we find the successive difference (first difference, second difference, third difference … so on).
Step 2: If first successive difference is in A.P, then general term can be taken as t
n
​
=an
2
+bn+c (i.e. consider t
n
​
as quadratic polynomial in the decreasing power of n with constants a,b,c ).
Step 3: If the second, third successive differences are in A.P, then t
n
​
=an
3
+bn
2
+cd+d for second successive difference in A.P and so on where a,b,c,d are constants whose order can be changed.