Progression (Sequence and Series)Hard
Question
The value of x + y + z is 15 if a, x, y, z, b are in A.P. while the value of 
is 
if a, X, Y, Z, b are in H.P., then a and b are-
is if a, X, Y, Z, b are in H.P., then a and b are-Options
A.1, 9
B.3, 7
C.7, 3
D.9, 1
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