Statements: All pens are books. Some books are pencils. Conclusions: I. Some pencils are pens. II. Some books are pens. MCQ with Answer and Explanation

Explanation:
2³−1=7, 3³−1=26, 4³−1=63, 5³−1=124, 6³−1=215, 7³−1=342.

Explanation:
The man has no brother or sister, so 'my father's son' is the man himself. Thus 'that man's father is myself', meaning that man is his son. The photograph is of his son.

Explanation:
The letters are simply reversed: STATIONERY reversed YRENOITATS but given RATSYENIOT is different grouping. Actual reverse of IMPROVEMENT is TNEMEVORPMI.