3 years ago

If the common difference of an ap is 3/2 and its 20 th term 35×1/2 find first term and 15 th term

1 answer:

4 0

Answer:

Step-by-step explanation:

d = 3/2

a₂₀ = a₁+19d

35/2 = a₁ + 19×3/2

a₁ = 35/2 - 19×3/2 = -11

a₁₅ = a₁+14d = -11 + 14×3/2 = 10

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