Letter and Symbol Series

The series is aab | aaab | aaaab | aaaaab  

The series is bcaab | bcaabb | bcaabbb.

The series is aabc | aabc | aabc.

The next two letters are U and F. Hence, option (4) is the correct answer.

The series consists of writing 3 letters in reverse alphabetical order from both the sides of the English alphabet. Z, Y, X, C, B, A, W, V, U, F, E, D. So, the next letters will be T, S, R. Hence, 2^nd option is right. 

The series follows the order: + 2, + 3, + 2 and + 3

T – 3 = Q Q – 3 = N N – 3 = K K – 3 = H H – 3 = E Hence, option (4) is the correct answer. 

The series consists of English alphabet starting from Y onwards (–1, –2, –3, –4 …… Y, W, T, P K, E, X, P, G). So, the right answer is option (1). 

The sequence consists of two series.

Backward series: XYZ, UVW

Forward series: CBA, FED The letters in both the series are arranged in reverse order. Hence, option (1) is the correct answer. 

The series consists of writing one letter and skipping one and writing two letters in the reverse order and again skipping one and so on. Hence, option (1) is the right answer. 

The group consists of 3 series of letters. The first series is of (+3); B + 3 = E, E + 3 = H, H + 3 = K, K + 3 = N.

Therefore, the series is B, E, H, K, N.

The second series is of (–4) and the third series is of (+2).  Hence, option (1) is the correct answer. 

The group consists of 3 series starting from D, K and Y. The first series is +2 series, the second series is –1 series and the third series is –2 series. Hence, 3^rd option is correct. 

The group consists of 3 letter series starting with C, J and Q. Each letter in the next term has moved one step forward, i.e. + 1. Hence, option (3) is the right answer. 

It’s a + 5 series. 2^nd option is right. 

There are two series running concurrently, one starting with the first letter of the alphabet (A) and the second with the last (Z). Thereafter, it is +1 at each step for the series starting with A and -1 for the series starting with Z. So, the correct answer is option (1).