The nth term if an A.P. is given by (-4n +15 ). Find the sum of the first 20thterms of this A.P.
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mihirsthacker:
You have written 20*4 = 100
Pagal Basic math sikh le pehle.
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Answered by
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An = 15-4n
A1 = 15-4
A = 11
A2 = 15-4*2
A2 = 7
d = 7-11 = -4
Sn = S20 = 20/2[2a + 19d]
= 10(2*11+19*-4)
= 10*-54
= -540
MARK AS THE BRAINLIEST.
Thanks buddy
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