Question

15,10,5...........in this a.p. what is the sum of first 10 terms?​

Answer 1

a=15 n=10

d= 10-5

= -5

d= -5

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

= 5{ 30 + 9(-5)}

= 5{-15}

= -75

Answer 2

Answer:

30

Step-by-step explanation:

because

15+10+5+0= 30

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