If 56, a,4 are in AP, the value of a is
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In an A.P., the sum of the first 10 terms is 150, and the sum of the next 10 terms is 550. Find the A.P.
Find the sum of first 25 terms of an A.P. whose nth term is 1−4n
The first and the last terms of an A.P. are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?
Find n if the given value of x is the nth term of the AP: 521,11,1621,22,... ; x=550.
In A.P., the first term is 8, nth term is 33 and sum to first n terms is 123. Find n and d, the common diffirence.
In an A.P., if a=3.5, d=0, n=101, then an will be
Find the sum of first 22 terms of an AP in which d=7 and 22nd term is 149.
If tn be the nth term of the A.P. −9,−14,−19,...., what is the value of t30−t20?