Question

Find a1 for a geometric Sequence
if r=5 and a6=1000

Answer 1

• The first term is 0.32

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Given

• GP with r = 5, a₆ = 1000

Use the nth term equation:

• aₙ = a₁*rⁿ⁻¹

Substitute and solve for a₁:

• 1000 = a₁*5⁵
• 1000 = a₁*3125
• a₁ = 1000/3125
• a₁ = 0.32