1. The greatest value of ab^3c is - (a...

1. The greatest value of `ab^3c` is -
(a) 3
(b) 9
(c) 27
(d) 81

2. Which statement is correct -
(a) `1/5 ge 1/(1/a+3/b+1/c)`
(b) `1/(25) ge 1/(1/a+9/b+1/c)`
(c) `1/5 ge 1/(1/a+9/b+1/c)`
(d) `1/(25) ge 1/(1/a+6/b+1/c)`

3. The least value of `x^2 + 3y + 1` is -
(a) 15
(b) greater than 15
(c) 3
(d) less than 15

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