Given, a= 407
d=403-407=-4
Therefore, a20= a+(n-1)d
= 407+19×(-4)
=331
Written on Feb. 9, 2018, 6:55 a.m.
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Answer of this question
In an AP 3,7............403,407 find 20th from the last
Comment
Given, a= 407
d=403-407=-4
= 407+19×(-4)
=331
Written on Feb. 9, 2018, 6:55 a.m.