Find the 21st term of the Arithmetic Progression (A.P.):&...
Find the 21st term of the Arithmetic Progression (A.P.): -4, -1.5, 1, 3.5,...
43.5
46
48.5
51
Correct answer is B
Tn=a+(n−1)d
d=T2−T1=T3−T2=−1.5−(−4)=2.5
T21=−4+(21−1)×2.5=−4+(20×2.5)
= −4+50=46
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