Find the sum of 7 terms of an arithmetic sequenc Those first and last term are 10 and 40 espectively.
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Find the sum of 7 terms of an arithmetic sequenc Those first and last term are 10 and 40 espectively.
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Answer:
S7=175
Step-by-step explanation:
Sn=n/2(a1 + an)
S7= 7/2 (10 + 40)
= 7/2(50)
= (7/2)(50/1)
=350/2
=175