Table of Contents ToggleEquation : Sum of n terms | Sn = n/2 [ 2a + (n-1) d ]Obtain the sum of the n terms of following series : 72+70+68+66+…Obtain the sum of the following sequence :(1) 2, 4, 6, 8, 10, … up to 12 terms (2) -8, -6, -4, -2, … up to 50 terms (3) 1, 5, 9, 13, 17, … up to 30 terms (4) 4, 8, 12, 16, 20, … up to 25 termsFor the series 10 + 9(1/2) + 9 +…+1/2, find number of terms – n and T17.The sum of 6 terms of an A.P. is 57, and the sum of its 10 terms is 155. Find 20th term.How many terms of the series 93+90+87+… amount to 975? Find the last term.Obtain the sum of first n natural numbers and hence find the sum of first 50 numbers.The Sum of n terms of an A.P. is 3n2 + n. Determine the nth term and also find 10th term of an A.P.Find the last term and sum of the series.(a+b) / (a+b) , (a+3b) / (a+b) , (a+5b) / (a+b) + … up to 15 termsHow to assume unknown terms of an A.P.The sum of three consecutive terms in A.P. is 18 and their product is 192. Find the three terms.The sum of four numbers in an A.P. is 24 and their product is 945. Find the four numbers. Equation : Sum of n terms | Sn = n/2 [ 2a + (n-1) d ] Obtain the sum of the n terms of following series : 72+70+68+66+… Obtain the sum of the following sequence : (1) 2, 4, 6, 8, 10, … up to 12 terms (2) -8, -6, -4, -2, … up to 50 terms (3) 1, 5, 9, 13, 17, … up to 30 terms (4) 4, 8, 12, 16, 20, … up to 25 terms For the series 10 + 9(1/2) + 9 +…+1/2, find number of terms – n and T17. The sum of 6 terms of an A.P. is 57, and the sum of its 10 terms is 155. Find 20th term. How many terms of the series 93+90+87+… amount to 975? Find the last term. Obtain the sum of first n natural numbers and hence find the sum of first 50 numbers. The Sum of n terms of an A.P. is 3n2 + n. Determine the nth term and also find 10th term of an A.P. Find the last term and sum of the series. (a+b) / (a+b) , (a+3b) / (a+b) , (a+5b) / (a+b) + … up to 15 terms How to assume unknown terms of an A.P. The sum of three consecutive terms in A.P. is 18 and their product is 192. Find the three terms. The sum of four numbers in an A.P. is 24 and their product is 945. Find the four numbers.
