Arithmetic Progressions

What is the sum of first 45 odd numbers?

• 2025

• 3025

• 2070

What is the sum of the terms?

1,7,13,19,25,31,37

• 123

• 133

• 266

The middle term of the AP

11,15,19...131

Find the missing terms of the following AP:

12, _____, ______, 0, -4

• a₂ = 16

• a₂ = 8

• a _{3 =} 4

• a _{3 = 20}

Which term of the AP is 4,9,14,... Is 109?

• 21

• 22

• 23

• 24

How many natural numbers are there between 200 and 500, which are divisible by 7?

• 42

• 43

• 44

• 45

The n ^th term of an AP is given by a _n = 2 - 3n.

The 31st term of the AP is

An Arithmetic Sequence is obtained by

(More than one answer)

• Adding a fixed number to the previous term.

• Adding the common difference to the previous term.

• Adding the first term to the previous term.

• Subtracting the common difference from the first term.

The n ^th term of an AP is given by

a _n = 5 - 2n ²

Will it form an AP?

• Yes

• No

What is the general formula for the n ^th term of an AP?

• a + (n-1)d

• a + (n+1)d

• 2a + (n - 1)d

• 2a + nd