If the sum of three consecutive terms of an increasing A.P. is 51 and the product of the first and third of these terms …

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

How many 2-digit positive integers are divisible by 4 or 9?

What is the sum of the first 11 terms of an arithmetic progression if the 3<sup>rd</sup> term is -1 and the …

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

If the first term of an A.P. is 2 and common difference is 4, then the sum of its 40 term is

If the sum of it terms of an A.P. is 2n<sup>2</sup> + 5n, then its nth term is

If the sums of n terms of two arithmetic progressions are in the ration $$\frac{{3n + 5}}{{5n + 7}},$$   then t…