Find the APP
for 8, 15,2a... to 20 terms
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a = 8 , d= 15-8 = 7 , n= 20
an = a+(n-1)d = 8+(20-1)×7 = 8+19×7 = 141
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Answer:
question is Find AP for 8,15,20to 20 terms
solution:- given,
a=8
d=15-8= 7
sn= n/2{2a+(n-1)d}
=20/2{2×8+(20-1)7}
10{16+19×7}
10(35×7)
10×245
2450answer
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