ans fast with photo
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Answered by
1
Answer:
1+2+3=3×4/2
next is
1+2+3+4= 4×5/2
and the other next is
1+2+3+4+5=5×6/2
Answered by
1
Answer:
d) 45
Step-by-step explanation:
1 = (1×2)/2
1+2 = (2×3)/2
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SO.
1+2+3+4+5+6+7+8+9 = (9×10)/2 = 90/2 = 45.
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