English Medium Class 10 - CBSE Question Bank Solutions

If the 3rd and the 9th terms of an AP are 4 and –8 respectively, which term of this AP is zero?

How many multiples of 4 lie between 10 and 250?

Determine the A.P. whose 3^rd term is 16 and the 7^th term exceeds the 5^th term by 12.

Find the 20^th term from the last term of the A.P. 3, 8, 13, …, 253.

Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the n^th week, her week, her weekly savings become Rs 20.75, find n.

Find the sum of the following APs:

2, 7, 12, ..., to 10 terms.

Find the sum of the following APs.

−37, −33, −29, …, to 12 terms.

Find the sum of the following APs.

0.6, 1.7, 2.8, …….., to 100 terms. 

Find the sum of the following APs.

`1/15, 1/12, 1/10`, ......, to 11 terms.

Find the sum given below:

`7 + 10 1/2 + 14 + ... + 84`

Find the sum given below:

34 + 32 + 30 + ... + 10

Find the sum given below:

–5 + (–8) + (–11) + ... + (–230)

In an AP: Given a = 5, d = 3, a_n = 50, find n and S_n.

In an AP, given a = 7, a₁₃ = 35, find d and S₁₃.

 In an AP Given a₁₂ = 37, d = 3, find a and S₁₂.

In an AP given a₃ = 15, S₁₀ = 125, find d and a₁₀.

In an AP given d = 5, S₉ = 75, find a and a₉.

In an AP, given a = 2, d = 8, and S_n = 90, find n and a_n.

In an AP given a = 8, a_n = 62, S_n = 210, find n and d.

In an AP given a_n = 4, d = 2, S_n = −14, find n and a.