find the sum of the following series 20+21+22....50
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Answered by
1
Sn= n/2 (2a + (n - 1)) d
the formula is here....
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13
Answer:
ooo
21+21+20+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+4*+47+48+49+50=1,085
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