Question

the term of an A, P is -3 and 10 th term is 15 find s10​

Answer 1

Answer:

s10 = 60

Step-by-step explanation:

a = -3

an = 15

S10 = 10/2 ( -3 + 15 )

  = 5 x 12

 =   60

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Answer 2

Answer:

a=-3

an=a+(n-1)d

a10=-3+(10-1)d

15=-3+9d

15+3=9d

d=2

Sn= n/2(2a+(n-1)d)

S10=10/2(2(-3)+(10-1)2)

S10=5(-6+18)

S10=5*12

S10=60

Hope it helps