Question

How many terms are there inthe gp 5,20,80,.......5120

Answer 1

Ur answer is 342

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Answer 2

Answer:

1. ar^n-1 =Tr.

• 5×4^n-1=5120
• 4^n-1=1204
• 4^n-1=4^5
• n-1=5
• n=6