Discussion Forum



In this type of questions, a series of single, pairs or groups of letters or combinations of letters and numerals are given. The terms of the series form a certain pattern as regards the position of the letter in the English alphabet. Find the missing or wrong term in series 

1)

Consider the following series: ABCD.....XYZ | YX.....BA | BCD.....YZ | YX.....CBA | BC... YZ...

which letter occupies the 1000th position in the above series?


A) B

B) C

C) X

D) Y

Answer:

Option A

Explanation:

We have 3 patterns :

I. ABCD .....XYZ, which occurs only once.

II. YX ..... BA, which repeats alternately.

III. BC .....YZ, which repeats alternately.

Now, I has 26 terms. So, number of terms before the desired term = (999 - 26) =973.

Each of the patterns which occur after I, has 25 letters.

Now, 973 ÷ 25 gives quotient = 38 and remainder = 23.

Thus, the 1000th term of the given series is the 24th term of the 39th  pattern after I.

Clearly, the 39th pattern is II and its 24th term is B.