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Analytical Aptitude

GATE CSE 2017 Set 1 · Q62

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Six people are seated around a circular table. There are at least two men and two women. There are at least three right-handed persons. Every woman has a left-handed person to her immediate right. None of the women are right-handed. The number of women at the table is

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Official answer: A) 2

Analytical Aptitude

Let the total number of people be 66, where MM is the number of men and WW is the number of women.

  1. Given constraints:

    • W≥2W \ge 2 and M≥2M \ge 2

    • Right-handed persons ≥3\ge 3

    • None of the women are right-handed   ⟹  \implies All women are left-handed.

    • Therefore, all right-handed persons must be men, which implies M≥3M \ge 3.

    • Since M+W=6M + W = 6 and M≥3M \ge 3, the possible values for WW are 22 or 33.

  2. Case 1: If W=3W = 3

    • Then M=3M = 3. Since there are at least 3 right-handed people, all 3 men must be right-handed.

    • This means the only left-handed people at the table are the 3 women.

    • The condition states that *every woman has a left-handed person to her immediate right*. Hence, the person to the immediate right of every woman must be another woman.

    • In a circular table of 6 people with 3 men and 3 women, if every woman must have a woman to her right, all women would have to be in an unbroken cycle of women, which would require all 6 people to be women (impossible since M=3M = 3). A block of 3 consecutive women W1−W2−W3W_1 - W_2 - W_3 leaves the last woman (W3W_3) with a man (who is right-handed) to her immediate right, violating the condition.

    • Thus, W=3W = 3 is not possible.

  3. Case 2: If W=2W = 2

    • Then M=4M = 4. Exactly 3 men can be right-handed and 1 man can be left-handed (MLM_L).

    • Seating arrangement (clockwise): W1→W2→ML→MR→MR→MRW_1 \to W_2 \to M_L \to M_R \to M_R \to M_R.

    • Right of W1W_1 is W2W_2 (left-handed).

    • Right of W2W_2 is MLM_L (left-handed).

    • This satisfies all conditions.

Thus, the number of women at the table is 2.

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This Analytical Aptitude previous year question is Q62 of the GATE CSE 2017 Set 1 paper. Find more GATE CSE PYQs on Analytical Aptitude in General Aptitude, or browse all GATE CSE PYQs.

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Analytical Aptitude in GATE CSE

Analytical Aptitude has 11 GATE CSE PYQs across 8 papers from 2017 to 2026. 7 of them are 2-mark MCQs like this one, and GATE CSE 2017 Set 1 has 2.

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GateAI solution cardGATE CSE 2017 Set 1 · Q62 · MCQ

Six people are seated around a circular table. There are at least two men and two women. There are at least three right-handed persons. Every woman has a left-handed person to her immediate right. None of the women are right-handed. The number of women at the table is

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