Question
Which of the four options will replace the question mark
(?) in the following series? XF 11 , YI 15, ZL 19 , AO 23, ?Solution
First position: X to Y: +1 Y to Z: +1 Z to A: +1 A to B : +1 Second position: F to I: +3 I to L: +3 L to O: +3 O to R : +3 Third position: 11 to 15: +4 15 to 19: +4 19 to 23: +4 23 to 27 : +4 Thus, the missing term in the series will be BR 27 . Thus, the correct option is (d).
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The soils of very cold climates which are defined as containing permafrost within two meters of the soil surface belongs to the order
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The only metallic element present in CHLORPHYLL
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