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Find the sum: i] 28 + 31 + ·········· ...

Find the sum:
i] `28 + 31 + ·········· + 100`
ii] `28 + 26 + ·········· + 10`.
iii] `3 + 11 + 19 + ......+ +803`.

Text Solution

Verified by Experts

The correct Answer is:
i] `=(25)/(2) xx (56 + 72) = (25)/(2) xx 128 = 25 xx 64 = 1600`.
ii] `=5 [ 56- 18] = 5 xx 38 = 190`
iii] `= 101 xx 403 = 407 03`.
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