ーー0.-Withoutu sırıcyisinc0n4. formulafor thsumーナーfind-the- – InterviewSolution

1.

ーー0.-Withoutu sırıcyisinc0n4. formulafor thsumーナーfind-the-y sum-of-theSexte

Answer»

This series is an A.P

so, here a = -10 , d = 4

and 20th term will be

a20 = a+(20-1)d = -10+19*4 = 66

so, sum till 20 terms will be

s20 = n/2*(a+l) = 20/2*(-10+66) = 10*56 = 560.

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