Fill in the blanks:
The sum of terms equidistant from the beginnng add end in an A.P. is equal to …………..

In an arithmetic progression, the sum of terms equidistant from the beginning and end is equal to

In a finite G.P., the product of the terms equidistant from the beginning and the end is always same and equal to the product of first and last terms.

Fill in the blanks ........... removes nucleotides from the end of the DNA.

Fill in the blanks _______removes nucleotides from the ends of the DNA.

Fill in the blank of A.P. 18, 13, ………… 3.

Fill in the blank of A.P. -5, -1, ………., 7.

The first and last terms of an A.P. are a and l respectively. Show that the sum of nth term from the beginning and nth term from the end is a + l.

In a sequence of 21 terms the first 11 terms are in A.P. with common difference 2. and the last 11 terms are in G.P. with common ratio 2. If the middle tem of the A.P. is equal to the middle term of the G.P., then the middle term of the entire sequence is

The sum of n terms of an A.P. is 3n^2 + 4n . Find the A.P.

The sum of first ten terms of an A.P. is 155 and the sum of first two terms of a G.P. is 9. The first term of the A.P. is equal to the common ratio of the G.P., and the first term of the G.P. is equal to the common difference of the A.P. Find the two progressions.