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1. In the following question, choose the number which is different from others in the group.
2. In the following question, choose the group of letters which is different from others.
3. What should be the next number in the series:
1, 3, 6, 10, 15, __
4. Which figure will come at the blank in the series:
V, VII, XI, XIV, _, XXI
5. In the given letter series, some of the letters are missing which are given in that order as one of the alternatives. Choose the correct alternative. Series: gfe_ig_eii_fei_gf_ii