नीचे दिए गए योगफलों को ज्ञात कीजिए: (i...

नीचे दिए गए योगफलों को ज्ञात कीजिए:
(i) `7 + 10(1/2) + 14 +................ + 84`
(ii) `34 + 32 + 30 + ............ + 18`
(iii) `-5 + (-8) + (-11) + ..............+(-250)`

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