Arithmetic Prog...

How many terms are there in the sequence 3, 6, 9, 12, ..., 111 ?

Find the sum of all odd integers between 2 and 100 divisible by 3.

Choose the correct answer from the given four options in the following question:
The first four terms of an A.P., whose first term is $$-2$$ and the common difference is $$-2$$, are 

Choose the correct answer from the given four options in the following question:
In an A.P., if $$d = -4, n = 7, a_n = 4,$$ then $$a$$ is

Choose the correct answer from the followings for the sequence $$-10, -6, -2, 2, ...$$

Next three consecutive numbers in the pattern are

Two APs have the same common difference and the 1st term of one AP is -1 and first term of other AP is -8. Then the difference between their 4th terms is

What is the common difference of an A.P. in which $$a_{18}-a_{14} = 32$$?

In an A.P $$1^{st}$$ term is $$1$$ and the last term is $$20$$. The sum of all terms is $$=399$$ then $$n=$$....

If $$a$$ is constant then $$a + 2a + 3a + ..... + na$$ is