Question : Directions: Which of the following letter clusters will replace the question mark (?) and complete the following letter cluster series?
IR, BY, UF, NM, GT, ?
Option 1: ZA
Option 2: ZB
Option 3: YA
Option 4: YB
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Correct Answer: ZA
Solution :
Given:
IR, BY, UF, NM, GT, ?
In the given series, subtract 7 from the place value of the first letter and add 7 to the place value of the second letter of the previous term to get the next term –
IR
→
I – 7 = B; R + 7 = Y
BY
→
B – 7 = U; Y + 7 = F
UF
→
U – 7 = N; F + 7 = M
NM
→
N – 7 = G; M + 7 = T
GT
→
G – 7 = Z; T + 7 = A
So, ZA is the missing term in the series. Hence, the first option is correct.
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