The 7th and 21st terms of an AP are 6 and -22 respectively. Find the 26th term

Answer: Option B

7^th term = 6
21^st term = -22
That means, 14 times common difference or -28 is added to 6 to get -22
Thus, d = -2
7^st term = 6 = a + 6d
Or, a + (6 × -2) = 6
Or, a = 18
26^st term = a + 25d = 18 -25 × 2 = -32