finf the sum of 23 terms of ap 17,12,7,2,-3...
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a =17
d =-5
n =23
S23= 23/2 (2×17 + 22×-5
=23 (17-55)
=-23×38
d =-5
n =23
S23= 23/2 (2×17 + 22×-5
=23 (17-55)
=-23×38
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Answered by
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a1=17
a2=12
d=a2-a1
=12-17
=-5
a=17
d=-5
for 23 term
a+22d
17+22(-5)
17+(-110)
17-110
-103
23 term=-103
a2=12
d=a2-a1
=12-17
=-5
a=17
d=-5
for 23 term
a+22d
17+22(-5)
17+(-110)
17-110
-103
23 term=-103
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