Answer:
Sn=2800
Step-by-step explanation:
Sum of arithmetic terms = n/2[2a + (n - 1)d]
Sn=35/2 [2(12)+(35-1)(4)]
sn=17.5[(24)+(34)(4)]
sn=17.5 [24+136]
sn =17.5 (160)
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Answer:
Sn=2800
Step-by-step explanation:
Sum of arithmetic terms = n/2[2a + (n - 1)d]
Sn=35/2 [2(12)+(35-1)(4)]
sn=17.5[(24)+(34)(4)]
sn=17.5 [24+136]
sn =17.5 (160)
Sn=2800