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