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tino4ka555 [31]
3 years ago
13

Find the sum of the first 20 term of the Series 5+8+11+14+....​

Mathematics
1 answer:
uranmaximum [27]3 years ago
3 0

Step-by-step explanation:

Sn=n/2(2a+(n-1)d). n=20

S20= 20/2 (2x5+(20-1)3 a=5

S20=10(10+57). d=8-5=3

S20=10x67

S20= 670

Hope this helps you

have a great day

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