Question

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Q 72. In a sequence, the sum of first n terms is equal to 5n2 + 6n. Find the sum of the 3rd, 4th and 5th terms of
the sequence.
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12.3
| 4 | 5 | 6
| 7 | 8 | 9
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Hi​

Answer 1

Answer:

I don't know the answer haha