Question

210,342,516,274, find the odd one?
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Answer 1

Answer:

Explanation:

210

Answer 2

Answer:

399

Explanation:

145=144=12

2

+1

Similarly,

197=196+1=14

2

+1

257=256+1=16

2

+1

325=324+1=18

2

+1

But,

399=400−1=20

2

−1