Find the 20^{th} term from the last term of t | vedclass

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(C) The given $A.P.$ is $3, 8, 13, \ldots, 253.$Here,the first term $a = 3$ and the common difference $d = 8 - 3 = 5.$The last term $l = 253.$To find

Vedclass · Accepted Answer

$158$

Vedclass · Answer

(C) The given $A.P.$ is $3, 8, 13, \ldots, 253.$Here,the first term $a = 3$ and the common difference $d = 8 - 3 = 5.$The last term $l = 253.$To find the $n^{th}$ term from the end,we can reverse the $A.P.$ or use the formula: $n^{th}$ term from the end $= l - (n - 1)d.$Here,$l = 253, n = 20, d = 5.$$20^{th}$ term from the end $= 253 - (20 - 1) 	imes 5.$$= 253 - (19 	imes 5).$$= 253 - 95.$$= 158.$Thus,the $20^{th}$ term from the last term is $158.$

Find the $20^{th}$ term from the last term of the $AP : 3, 8, 13, \ldots, 253.$

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