find out the sum of 34,32,30,...10
Answers
Answered by
1
Step-by-step explanation:
a= 34
d = 32-34=-2
an= a + (n-1)d
10 = 34 + (n-1) -2
10-34 = -2(n-1)
-24 = -2(n-1)
12 = n-1
13= n
S = n/2 [2a +(n-1)d]
S= 13/2 [ 2×34 + 12(-2)]
S = 13/2 ( 68 - 24)
S = 13/2 (44)
S = 13 × 22
S = 286
Answered by
0
Answer:
286
Step-by-step explanation:
a= 34
d = 32-34=-2
an= a + (n-1)d
10 = 34 + (n-1) -2
10-34 = -2(n-1)
-24 = -2(n-1)
12 = n-1
13= n
S = n/2 [2a +(n-1)d]
S= 13/2 [ 2×34 + 12(-2)]
S = 13/2 ( 68 - 24)
S = 13/2 (44)
S = 13 × 22
S = 286
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