Nth term=a+(n-1)d
2( a+(8-1)d= a+(4-1)d
2a+14d=a+3d........1
40= a+(20-1)d
= 40=a+19d...............2
1......... a=-11d
, 40=-11d+19d
40=8d.......
=d =5
a=-11 ×5 =-55
Sheldon Alvin answered the question on September 16, 2018 at 21:30
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