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General Term of an Geometric Progression

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CISCE: Class 10

Formula: General (nᵗʰ) term

Tn = arn1

when you need the nth term (8th term, 15th term, etc.)

When the G.P. is finite, and you are finding the last term

CISCE: Class 10

Formula: nᵗʰ Term from the End of a G.P.

nᵗʰ Term from the End \[=\frac{l}{r^{n-1}}\]

When to Use

  • G.P. is finite

  • Last term, l is known

  • Common ratio r is known

CISCE: Class 10

Formula: Common Ratio

r \[=\frac{T_2}{T_1}\]​

Important facts:

  • If r > 1→ increasing G.P.

  • If 0 < r < 1 → decreasing G.P.

  • If r < 0 → terms alternate in sign

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