In an AP, if d = –4, n = 7, a_n = 4, then a is

The 21st term of the AP whose first two terms are –3 and 4 is

If the common difference of an AP is 5, then what is a₁₈ – a₁₃?

The sum of first five multiples of 3 is

The middle most term (s) of the AP:–11, –7, –3, ..., 49 is:

If 7 times the 7th term of an AP is equal to 11 times its 11th term, then its 18th term will be

In an AP if a = 1, a_n = 20 and S_n = 399, then n is

If the numbers n – 2, 4n – 1 and 5n +2 are in AP, then the value of n is:

The first four terms of an AP, whose first term is –2 and the common difference is –2, are