The 21st term of an AP

Question:

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

(a) 17               

(b) 137                      

(c) 143                     

(d)-143

Solution:

(b) Given, first two terms of an AP are a = – 3 and a + d = 4.

⇒                                          – 3 + d = 4

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