What is the sum of the first 20 terms of the AP 4,2,0
2 answers:
Answer:
-420
Step-by-step explanation:
common difference= 2-4 =-2
we have,
first term=4
now using the formula,
S=N/2(2a+(n-1)d
so the answer is -420
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Step-by-step explanation:
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