5. If a:b=b:c, then b is called the mean proportional between a and c; and a, b, c are said to be in continued proportion. Are the following in continued proportion? (i) 2, 4,8 (ii) 2, 6, 18 (iii) 2.8. 42 (iv) 7, 14,28
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2,4,8
because
2:4::4:8
2/4,4/8=1/2,1/2
it means ans is 1:2::1:2
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