Find the sum of all odd no.between 70 and 170
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Answer:
6000
Step-by-step explanation:
sum of all odd no.between 70 and 170
= 71 + 73 + 75 + ... + 169 (50 number of terms)
= 50×{2×71+(50-1)×2}/2
= 25×(142+98)
= 25×240
= 6000
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