# Write True or false : (a) The duplicate ratio of 1 : ab is 1 : a^(2)b^(2) (b) The sub-duplicate ratio of 4:9 is 3:2.

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Write True or false :
(a) The duplicate ratio of 1 : ab is 1 : a^(2)b^(2)
(b) The sub-duplicate ratio of 4:9 is 3:2.

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(a) The duplicate ratio of 1 : ab " is " (1)^(2) : (ab)^(2) = 1 : a^(2)b^(2)
Hence the given statement is true .
(b) The sub- duplicate ratio of  4 : 9 " is " sqrt(4) : sqrt(9) = 2 : 3 ,  which is not equal to  3 : 2 .
Hence the given statement is false.