Question

the nth term of the ap is 15,10,5... is​

Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

a=15

d=10-15= -5

n=10

nsn =× (2a + (n − 1)d)

10 2 sn = × (2 × 15+ (10 – 1) × −5)

sn = 5 × (30+ (9) × −5)

sn = 5 × (30-45)

sn = 5 × (-15)

sn = -75

So the sum of first 10 terms of this AP are -73