find the sum of first twenty terms of ap series 2+7+12
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Answered by
1
here a= 2 and d=5 And a+19d=2+19×5=97
Answered by
9
hey! your answer↓
a=2, d=5, S20=?
S20=n/2[2a+(n-1) d]
=20/2[2×2+(20-1) 5]
=10(4+19×5)
=10(4+95)
=10×99
=990
the sum of the 20 numbers of the app is
990
hope that it will help you
kindergarden:
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