Find the 20th term of arithmetic progressions, Mathematics

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Find the 20^th term from the end of the AP 3, 8, 13........253.

Ans: 3, 8, 13 .............. 253

Last term = 253 a20 from end

= l - (n-1)d

253 - ( 20-1) 5

253 - 95

= 158

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