Discussion

Explanation:

Sn = n2 + n + 1

Tn = Sn - Sn-1

∴ T15 = S15 - S14

⇒ T15 = (152 + 15 + 1) - (142 + 14 + 1)

⇒ T15 = 241 - 211 = 30.

Hence, 30.

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