Which of these are arithmetic progressions and why?
(ii) 2,5,7,0,12,15,....

Which of these are arithmetic progressions and why? (i) 2,3,5,7,8,10,15, ......

Which of these are arithmetic progressions and why? (iii) -1, -3, -5, -7, .......

In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (ii) The amount of air present in a cylinder when a vacuum pump removes 1//4^(th) of the air remaining in the cylinder at a time.

In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (iv) The amount of money in the account every year, when Rs. 10000 is deposited at compound intrest at 8% per annum.

Find the sum to indicated number of terms in each of the geometric progressions in 0.15, 0.015, 0.0015 ,.........20 terms .

Find the 7^(th) term from the end of the Arithmetic Progression. 7, 10, 13, ……, 184.

If seven times of 7th term of an Arithmetic Progression is euqal to the 11 times of 11^(th) term of it, then find the 18^(th) term of that Arithmetic Progression.

The sums of n terms of two arithmetic progressions are in the ratio 5n + 4 : 9n + 6. Find the ratio of their 18^(th) terms.

If the coefficients of x^9, x^10, x^11 in the expansion of (1+x)^n are in arithmetic progression then n^2=41n=