Find the missing term(s) :
1 BR, 2 EO,6 HL,15 KI,?

22 NF

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31 NF

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31 NE

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28 NF

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Solution

The correct option is D 31 NF
Option B is the correct answer
Explanation:
The first number in the terms follow the sequence
${1 + 1}^{2} = 2 2 + 2^{2} = 6 6 + 3^{2} = 15 ‘ 15 + 4^{2} = 31$
The second letter of
each group differs by 3 letters in the forward direction. Third letter of each group differs by 3
letters in the backward direction. Hence, the next term would be 31NF.

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