Discussion

Explanation:

x = 175 + 174 + 17 + 1
= 174 (17 + 1) + (17 + 1)
= (174 + 1) × (17 + 1)
Hence, x is a composite number.

y = 118 – 115 – 113 – 1
= (118 – 1) – (115 + 111)
= (114 – 1) (114 + 1) – 113 (112 + 1)
= (112 - 1) (112 + 1) (114 + 1) – 113 (112 + 1)
= (112 + 1)[(112 – 1)(114 + 1) - 113]
Hence, y is a composite number.

Hence, option (d).

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