Question

The 21st term of AP whose first two terms are -3 and 4 is:

Answer 1

137

Step-by-step explanation:

In the given AP, t1 = -3 and t2 = 4

=> d = t2 - t1

=> 4 - (-3)

=> 7

=> tn = a + (n-1)d

=> t21 = (-3) + (21-1)(7)

=> 137