Arithmetic Prog...

Calculate the sum of even numbers between $$12$$ and $$90$$ which are divisible by $$8$$.

The first term and last term number is $$12$$ and $$30$$. The total number of term is $$50$$. Find its sum.

Calculate the sum of whole numbers between 0 and 79 which are divisible by 11.

Calculate the sum of even numbers between 100 and 150 which are divisible by 13.

Find the sum of even numbers between 1 and 25.

If $$a_3 = 9$$ and $$a_7 = 21$$. Find $$S_5$$

Check whether $$80$$ is a term of the AP. $$0, 0.5, 1, 1.5,\dots$$

Find the $$12^{th}$$ term from the end of the A.P. $$2, 6, 10 ......... 58$$

Find the common difference for the arithmetic sequence whose formula is $$a_n = 12n - 7$$

Find the common difference, if $$a_2 = 10$$ and $$a_5 = 20$$.