Question : Directions: The following series has one term missing. Select the correct alternative from the options below to complete the series.
A7F, E15J, I23N, ?
Option 1: R13M
Option 2: M31R
Option 3: R23M
Option 4: R37S
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Correct Answer: M31R
Solution :
Given:
A7F, E15J, I23N, ?
Add 4 to each letter and 8 to each number of the previous term to obtain the next term in the series.
A7F→A + 4 = E; 7 + 8 = 15; F + 4 = J→E15J
E15J→E + 4 = I; 15 + 8 = 23; J + 4 = N→I23N
I23N→I + 4 = M; 23 + 8 = 31; N + 4 = R→M31R
M31R is the missing term of the series. Hence, the second option is correct.
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