The first term of an A.P is 4 and common difference is-3 find the sum of the firdt 20 term of A.P
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-530 is the answer as sn=n/2(a+(n-1)d)
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Answer:
Step-by-step explanation:
given a=4 d=-3
a20= a+19d
=4+19*-3
= -53
s20=20/2(4+ -53)
=10*-49
= -490
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