use this formula to find the sum of the following
102, 97,92, upto 27 terms
Hint:-
a=102 d=5 Sn=S27
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Answer:
Sn = S 27 = 4509
Step-by-step explanation:
Given Sn = S27
consider S27 as the last term
Using the formula Sn = n/2 { 2a + (n-1) d }
S27 = 27/2 { 2(102) + (27 -1) 5 }
= 27/2 { 204 + (26× 5) }
= 27/2 ( 204 + 130 )
= 27/2 ( 334 )
= 13.5 ( 334 )
S27 = 4509
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