hey.....
step by step expalanation....
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Answer:
Step-by-step explanation:
a+ 13 d = 2(a+7d)
a + 13d = 2a + 14d
-a -d = 0
a+ d = 0 = a2 ---- --------> 1
a + 5d = -8 -----> 2
2-1
a + 5d = -8
a +. d = 0
------------------
a = 2
D = -2
a 20 = 2+ 19*-2
= -36
S20 = 10(2+(-36))
= -340
Hope it's helpful.
All the best.
aastha4865:
how a+d =0 =a2......????
my dear your step is wrong a + 13d = 2a + 14d, therefore a + d =0
not - a - d =0
i right that to other answer....not in ur answer....plz check...@parth7455
what you mean
nothing....leave
and you can call me Parth
OK fine
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If do you like my steps please follow me.
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