1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

If a, b, c are in A.P., $$b-a,c-b$$ and a are in G.P., then a : b : c is

A
1 : 2 : 3
B
1 : 3 : 5
C
2 : 3 : 4
D
1 : 2 : 4
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

$${1 \over {2\,.\,5}} + {1 \over {5\,.\,8}} + {1 \over {8\,.\,11}} + ............. + {1 \over {(3n - 1)(3n + 2)}} = $$

A
$${n \over {6n + 3}}$$
B
$${n \over {6n - 4}}$$
C
$${{n + 1} \over {6n + 4}}$$
D
$${n \over {6n + 4}}$$
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