plz answer this with solution
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Given,
a(n) = 7 - 3n....(1)
Putting the Value of n = 1,2,3....in Eq. (1) we have,
a(1) = 7 - 3*1 = 7 - 3 = 4
a(2) = 7 - 3*2 = 7 - 6 = 1
a (3) = 7 - 3*3 = 7 - 9 = - 2
.....
....
...
Here, We have,
AP:- 4, 1, - 2........
Where,
a = 4
d = a2 - a1 = ( 1 - 4) = - 3
Therefore,
a(20) = a + 19d
= 4 + 19 (-3)
= 4 - 57
= - 53
Hope it helps ©