find the sum of the first 40 term of an ap 5, 0 - 5, - 10 ...
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-3700 is sum of first 40 term of given A.P
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Answer:
-3700
Step-by-step explanation:
a=5
d= -5
S40= 40/2*[2(5)+(40-1)(-5)]
=20*[10+(39)(-5)]
=20*[10+(-195)]
=20*(-185)
=-3700
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