HOW MANY B's will come in the 27th arrangement of the pattern below
AAABBAAAABBBAAAAABBBB
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the answer in the 27th arrangement is 405
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Given : AAABBAAAABBBAAAAABBBB
To find : HOW MANY B's will come in the 27th arrangement of the pattern
Solution:
AAABBAAAABBBAAAAABBBB
1st arrangement AAABB
3 A's , 2 B's
2nd arrangement AAAABBB
4 A's , 3 B's
3rd arrangement AAAAABBBB
5 A's , 4 B's
Hence nth arrangement
n+2 A's , n + 1 B's
B's will come in the 27th arrangement = 28
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