Question
If a, b, c are in geometric progression and a + b + c =
14, aĀ² + bĀ² + cĀ² = 84, find a, b, c.Solution
ATQ,
Let a = x, b = xr, c = xrĀ² Sum: x(1 + r + rĀ²) = 14 Squares: xĀ²(1 + rĀ² + rā“) = 84 Divide 2nd by (1st)Ā²: (1 + rĀ² + rā“)/(1 + r + rĀ²)Ā² = 84/14Ā² = 84/196 = 3/7 Try r = 2 ā (1+4+16)/(1+2+4)Ā² = 21/49 = 3/7 ā Then x(7) =14 ā x = 2 ā (a,b,c) = (2,4,8)
Conservation Agriculture include adoption of -
(A). burning of crop residues to manage pests.
(B). minimum tillage
(C). crop rotati...
How many days extra work is provided over and above 100 days for the drought affected areas or natural calamity areas under MGNREGA?
Potato spindle tuber disease is transmitted by:
Which of the following is not an essential criterion for seed certification?
A method in which methods of sowing seeds, technology use is demonstrated toĀ group of farmers
Water is drawn upwards from the water table in a continuous network of pores. This upward movement of water occurs only in saturated soils is called
Which of the following statements is/are true?
Statement A: Potassium is involved in regulating plant water uptake and maintaining turgidity.
...The total age of rice seedling for transplanting in main field through double transplanting method
In Lepidopteran insects, the goblet cells found in the midgut are mainly involved in the accumulation of:
Part of the cell wall of endodermal cells prevents water from moving into the cell is calledĀ
