My question is 11,22,33... Find the sum of the first 25 terms
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3575
Sn =n/2(2a+(n-1)d)
Sn =n/2(2a+(n-1)d)
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AP = 11, 22, 33...
➡n = 25
➡ a = 11
➡d = 11
➡ Sn = n/2 {2a + ( n-1 ) d }
➡ 25/2 { 2*11 + ( 25-1 ) 11 }
➡ 25/2 { 22 + ( 24 ) 11 }
➡ 25/2 { 22 + 264 }
➡ 25/2 { 286 }
➡ 3575
Sum of the first 25 terms of this AP is 3575.
Hope it will help u !!
➡n = 25
➡ a = 11
➡d = 11
➡ Sn = n/2 {2a + ( n-1 ) d }
➡ 25/2 { 2*11 + ( 25-1 ) 11 }
➡ 25/2 { 22 + ( 24 ) 11 }
➡ 25/2 { 22 + 264 }
➡ 25/2 { 286 }
➡ 3575
Sum of the first 25 terms of this AP is 3575.
Hope it will help u !!
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