Question
Nine boys have to stand in a circle. In how many ways
they are to be stand on the circumference of circle?Solution
Any boy may be stand on any place so there is no difference in clockwise and anticlockwise direction here.  Requirement permutations = 1/2 × (n - 1)!  => 1/2 × (9 - 1)!  => 1/2 × 8!  => 20160
Unconsolidated deposits of CaCO3, used a liming material is
The line connecting the regions of equal rainfall is called as
This training system involves training fruit trees to grow in a flat, formal pattern against a support structure like a wall or trellis. This space-effi...
Based on morphology, weeds are NOT classified as ________.
The moulting hormone in insects is secreted by which part of their body?Â
Little leaf in mango and cashew is due to deficiency of
In plant, the cell walls of ___ cells are coagulated with the deposition of suberin which makes them impervious to water and air.
Truly migratory fish, the migrations of which occur wholly within freshwater is classified as
In ammonium sulphate nitrate fertilizer, the ratio of ammonical-N and nitrate-N is:
Peat and Muck soils are
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