Find the 30th term of an A.P: 9, 4, -1, -6, -11, ... *
-110
-129
-136
149
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3
Answer:
A . P :: 9 , 4 , -1 , -6 , -11 , ...
a1 = 9 a2 = 4
d= a2 - a1
= 4 - 9
= -5
a30 = a + 29d
= 9 + 29 × -5
= 9 - 145
= -136
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