Sequences and Series
Find x, if the given numbers are in A.P. (a+b)2,x,(a−b)2
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?
Ramkali saved Rs 5 in the first week of a year and then increased her weekly savings by Rs 1.75. If in the nth week, her weekly savings become Rs 20.75, find n.
For the following AP's, write the first term and the common difference:
What will Rs. 500 amounts to in 10 years after its deposit in a bank which pays annual interest are 10% compounded annually?
A person writes a letter to four of his friends. He asks each one of them to copy the letter and mail to four different persons with instruction that they move the chain similarly. Assuming that the chain is not broken and that it costs 0 paise to mail one letter. Find the amount spend on the postage when 8th set of letter is mailed.