Question
Synthetic pyrethroids should not be used for the
control of rice insect pest because it increase the population ofSolution
Two species of planthopper infest rice. These are the brown planthopper (BPH), Nilaparvata lugens (Stal); and the whitebacked planthopper (WBPH), Sogatella furcifera (Horvath).
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1.36, 2.72, 5.44, 10.88, 21.76, ? 4, 7, 12, 21, 36, ?
What will come in place of the question mark (?) in the following series?
20, ?, 30, 60, 150, 450
84, 63, ?, 283.5, 1701
(14.073)² + (32.103)² + (43.9653)² + (52.983)² + ? = (102.45)² + (98.007)²
70, 69, 73, 64,80, 55, ?
What will come in place of the question mark (?) in the following series?
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8, 9, 125, ?, 1331, 169Â
2.5Â Â Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.25Â Â Â Â Â Â Â 1.875Â Â Â Â Â 3.75Â Â Â Â Â Â Â ?
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