Find the sum of the 20th term: -10; -3; 4; 11;……….
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Step-by-step explanation:
Given : a = -10 , d = 7 and n = 20
Sum of n terms is n /2 ( 2a+ (n-1 ) d)
20/2( 2 × (-10) + 20-1 × 7 )
1130 is the answer
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