Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
 _bc_ca_aba_c_ca

Select the option that will fill in the blank and complete the given series.
DXB, GSI, JNP, MIW,___

Directions: Study the following information carefully and answer the given questions.

Six persons- L, M, N, O, P, and Q are taking the vaccination in different months- January, May and November on different dates- 2nd and 9th. All of them were wearing different colour dresses- Red, Yellow, White, Green, Blue, Black but not necessarily in the same order. M takes the vaccine on three persons before the one who wears Black . The one who takes the vaccine while wearing black does not take in the last. Q takes three persons before the one who takes immediately after P. Q takes on any 2nd date of any month. There is a gap of one person between O and the one who wears Yellow colour. O takes the vaccine before Yellow. L takes the vaccine before N and only one person takes the vaccine between them. The one who wears Blue is taking the vaccine before the one who takes while wearing White and the same number of people who take the vaccine between N who wears White and the one who is wearing Blue is the same as between L and N. M does not wear red while taking vaccine.

Who took the vaccine on 9 May?

In the Venn diagram given below, the circle represents ‘North Indian’ the triangle represents ‘Pianists’ the rectangle represents ‘Males’ and the square represents ‘Engineers’. The numbers given in the diagram represents number of persons of that particular category. Who among the following is a female, North Indian, Engineer?

Four pairs of letters -cluster have been given out of which three are alike in some manner, while one is different. Choose the odd one.

In a year-end examination, 6 papers- Maths, Physics, Geography, Economics, Chemistry, History- are scheduled on 6 consecutive days of a week (Monday - Saturday)
 1. Maths paper is after the Chemistry paper, with a 1-day gap between them.
 2. Physics paper is on Monday.
 3. Geography paper is not on the last day.
 4. History paper, which is scheduled on the previous day of the Maths paper, has a two-day gap with the Physics paper.
 Which paper is scheduled on Saturday?

In the following question, select the odd number pair from the given alternatives.

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
5, 11, 21, 43, 85, ?