gth term of Ap-40, -15, 10, 35
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Step-by-step explanation:
General form of an Arithmetic Progression :
a, a+d, a+2d,....,a+(n-1)d
a is the first term
d is the common difference.
if a1, a2, a3, a4... are in AP
d = a2- a1 = a3 - a2 = a4 - a3 = ...
.
a = -40
d = (-15) - (-40) = 30
.
gth term =a + (g- 1) d
= -40 + (g-1) 30
= -40 + 30g -30
= 30g - 70
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