AP,GP plz help me I can't understand
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Answer:
first term is 8
d=2
60th term is 8+59×2
=8+118
=126
sum of last 10terms is
=sum of 60 terms -sum of first 50 terms
=30×(16+59×2) -25(16+49×2)
=134×30-25×114
=4020-2850
=1370
ok
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