1.

In an A.P. first two terms are – 3, 4, then 21st term is ….(A) -143 (B) 143 (C) 137 (D) 17

Answer»

Correct answer is

(C) 137

a=(-3)
d=4-(-3)=7
t
n=a+(n-1)d
t21=-3+(21-1)7
     =137


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