The sum of three numbers in A.P. is 18. ...

The sum of three numbers in A.P. is 18. If the first two numbers are each increased by 4 and the third is increased by 36, the new numbers form a G.P., then common difference of A.P. is

A

a) -8 and 40

B

b) 8 or -40

C

c) 6 and -42

D

d) -6 or 42

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