The 30th term of the A.P. 10, 7, 4, … is
87
77
-77
-87
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The above series is an A.P. with first term = a = 10 and common difference = d = 7 - 10 = -3.
We know that
an = a + (n - 1)d∴ a30 = 10 + (30 - 1) × (-3) = 10 + 29 × (-3) = 10 - 87 = -77.
Hence, Option 3 is the correct option.
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In a Geometric Progression (G.P.) the first term is 24 and the fifth term is 8. Find the ninth term of the G.P.
The 10th term of the A.P. 5, 8, 11, 14, …. is
32
35
38
185
The 15th term from the last of the A.P. 7, 10, 13, … , 130 is
49
85
88
110