Asked by angela
A pattern is given as:
1 = (1 × 2) ÷ 2
1 + 2 = (2 × 3) ÷ 2
1 + 2 + 3 = (3 × 4) ÷ 2
1 + 2 + 3 + 4 = (4 × 5) ÷ 2
1 + 2 + 3 + 4 + 5 = (5 × 6) ÷ 2 and so on
What will be the value of 1 + 2 + 3 + 4 + 5 + ....+ 20?
1 = (1 × 2) ÷ 2
1 + 2 = (2 × 3) ÷ 2
1 + 2 + 3 = (3 × 4) ÷ 2
1 + 2 + 3 + 4 = (4 × 5) ÷ 2
1 + 2 + 3 + 4 + 5 = (5 × 6) ÷ 2 and so on
What will be the value of 1 + 2 + 3 + 4 + 5 + ....+ 20?
Answers
Answered by
DrBob222
Would that be 20*21/2 ?
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