Question

( a, b, c, a, quad Rightarrow quad f_{a}= )
( b^{2}=a cdot c, )
( 2 c=a+b )
( b+c=a quad b+b=c )
( c+a=c+b=a )

# There are four numbers of which the first three are in G.P. and the last three are in A.P., whose common difference is 6. If the first and the last numbers are equal then two other numbers are (a) -2,4 (b) –4, 2 (c) 2,6 (d) None of these

Solution