find the sum of the numbers between 1 and 20
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Answered by
0
Answer:
210
Step-by-step explanation:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20 = 210
Answered by
0
s= n/2 [2a +(n-1)d]
n: number of terms =20
a: first term. =1
d:common difference=1
=20/2 [2*1+(20-1)1]
=10(2+19)
=210
n: number of terms =20
a: first term. =1
d:common difference=1
=20/2 [2*1+(20-1)1]
=10(2+19)
=210
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