16. (a) Find 1+2+3+...to 100 terms.
(b) Find 1+2+3+...+50.
(c) Find 1+ 2+ 3+ ... +20,
(d) Find 21 +22+23+ ... + 60.
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1
Answer:
answer of part a)5050
Step-by-step explanation:
a)by using the formula n/2[2a+(n-1)d]
100/2[2×1+(100-1)×1]
50(2+99)
50×101
5050
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Answer:
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