Find the sum of Frist 20th terms of arithmetic 2+7+12+.......so on using suitable formula
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sequence . 2+7+12+......
common difference = 7-2
=5
sum=n/2 (2a+(n-1)d)
s= 20/2( 2*2 +( 20-1) 5)
s= 10(4+19 *5)
s=10(4+95)
s=10(99)
s=990
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