What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?

Find the n<sup>th</sup> term of the following sequence :</br> 5 + 55 + 555 + . . . . T<sub>n<…

If a rubber ball consistently bounces back $$\frac{{2}}{{3}}$$ of the height from which it is dropped, what fraction of …

The sum of first five multiples of 3 is:

The sum of first 20 odd natural numbers is

If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18<sup…

If 7<sup>th</sup> and 13<sup>th</sup> terms of an A.P. be 34 and 64 respectively, then its 18&lt…

The first and last terms of an A.P. are 1 and 11. If the sum of its terms is 36, then the number of terms will be