The first term of an A.P. is 5, the common difference is 3 and the last term is 80, find the number of terms.
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In an A.P., the first term is 2, the last term is 29 and sum of the terms is155. Find the common difference of the A.P.
How many two–digit numbers are divisible by 3?
Find the 12th term from the end of the AP: 2, 4, 6,..., 100.
A spiral is made up of successive semicircles, with centers alternately at A and B, starting with center at A, of radii 0.5 cm,1.0 cm,1.5 cm,2.0 cm, . . . as shown in Fig. What is the total length of such a spiral made up of thirteen consecutive semicircles
First the term of an A.P is p and its common difference is q. Find its 10th term
Find the sum of the first 15 multiples of 8.
A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows: Rs. 200 for the first day, Rs. 250 for the second day, Rs. 300 for the third day, etc., the penalty for each succeeding day being Rs. 50 more than for the preceding day. How much money the contractor has to pay as penalty, if he has delayed the work by 30 days.
If the nth term of a progression is (4n−10) show that it is an AP. Find its 16th term.